diff --git a/src/dawg.cpp b/src/dawg.cpp
index 7e9d536..e5e903a 100644
--- a/src/dawg.cpp
+++ b/src/dawg.cpp
@@ -1,5 +1,19 @@
 /* Generated by Cython 0.29.15 */
 
+/* BEGIN: Cython Metadata
+{
+    "distutils": {
+        "depends": [],
+        "language": "c++",
+        "name": "dawg",
+        "sources": [
+            "src/dawg.pyx"
+        ]
+    },
+    "module_name": "dawg"
+}
+END: Cython Metadata */
+
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
 #ifndef Py_PYTHON_H
@@ -870,7 +884,7 @@ struct __pyx_opt_args_4dawg_7IntDAWG_get;
 struct __pyx_opt_args_4dawg_17IntCompletionDAWG_get;
 struct __pyx_opt_args_4dawg_17IntCompletionDAWG_items;
 
-/* "dawg.pyx":307
+/* "dawg.pyx":325
  *         self.guide.Clear()
  * 
  *     cpdef list keys(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -882,7 +896,7 @@ struct __pyx_opt_args_4dawg_14CompletionDAWG_keys {
   PyObject *prefix;
 };
 
-/* "dawg.pyx":526
+/* "dawg.pyx":544
  *         return res
  * 
  *     cpdef get(self, key, default=None):             # <<<<<<<<<<<<<<
@@ -894,7 +908,7 @@ struct __pyx_opt_args_4dawg_9BytesDAWG_get {
   PyObject *__pyx_default;
 };
 
-/* "dawg.pyx":582
+/* "dawg.pyx":600
  *         return self._value_for_index(index)
  * 
  *     cpdef list items(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -906,7 +920,7 @@ struct __pyx_opt_args_4dawg_9BytesDAWG_items {
   PyObject *prefix;
 };
 
-/* "dawg.pyx":661
+/* "dawg.pyx":679
  *             yield (u_key, value)
  * 
  *     cpdef list keys(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -918,7 +932,7 @@ struct __pyx_opt_args_4dawg_9BytesDAWG_keys {
   PyObject *prefix;
 };
 
-/* "dawg.pyx":846
+/* "dawg.pyx":885
  *         return [self._struct.unpack(val) for val in value]
  * 
  *     cpdef list items(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -930,7 +944,7 @@ struct __pyx_opt_args_4dawg_10RecordDAWG_items {
   PyObject *prefix;
 };
 
-/* "dawg.pyx":885
+/* "dawg.pyx":924
  *         return res
  * 
  *     cpdef get(self, key, default=None):             # <<<<<<<<<<<<<<
@@ -942,7 +956,7 @@ struct __pyx_opt_args_4dawg_7IntDAWG_get {
   PyObject *__pyx_default;
 };
 
-/* "dawg.pyx":929
+/* "dawg.pyx":988
  *         return res
  * 
  *     cpdef get(self, key, default=None):             # <<<<<<<<<<<<<<
@@ -954,7 +968,7 @@ struct __pyx_opt_args_4dawg_17IntCompletionDAWG_get {
   PyObject *__pyx_default;
 };
 
-/* "dawg.pyx":951
+/* "dawg.pyx":1010
  *         return self.dct.Find(key)
  * 
  *     cpdef list items(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -981,7 +995,7 @@ struct __pyx_obj_4dawg_DAWG {
 };
 
 
-/* "dawg.pyx":293
+/* "dawg.pyx":311
  * 
  * 
  * cdef class CompletionDAWG(DAWG):             # <<<<<<<<<<<<<<
@@ -994,7 +1008,7 @@ struct __pyx_obj_4dawg_CompletionDAWG {
 };
 
 
-/* "dawg.pyx":460
+/* "dawg.pyx":478
  * DEF MAX_VALUE_SIZE = 32768
  * 
  * cdef class BytesDAWG(CompletionDAWG):             # <<<<<<<<<<<<<<
@@ -1009,8 +1023,8 @@ struct __pyx_obj_4dawg_BytesDAWG {
 };
 
 
-/* "dawg.pyx":807
- * 
+/* "dawg.pyx":846
+ *             raise KeyError("No prefix found")
  * 
  * cdef class RecordDAWG(BytesDAWG):             # <<<<<<<<<<<<<<
  *     """
@@ -1022,7 +1036,7 @@ struct __pyx_obj_4dawg_RecordDAWG {
 };
 
 
-/* "dawg.pyx":866
+/* "dawg.pyx":905
  * DEF LOOKUP_ERROR = -1
  * 
  * cdef class IntDAWG(DAWG):             # <<<<<<<<<<<<<<
@@ -1034,7 +1048,7 @@ struct __pyx_obj_4dawg_IntDAWG {
 };
 
 
-/* "dawg.pyx":909
+/* "dawg.pyx":968
  * 
  * # FIXME: code duplication.
  * cdef class IntCompletionDAWG(CompletionDAWG):             # <<<<<<<<<<<<<<
@@ -1046,8 +1060,8 @@ struct __pyx_obj_4dawg_IntCompletionDAWG {
 };
 
 
-/* "dawg.pyx":256
- *         return res
+/* "dawg.pyx":274
+ *             raise KeyError("No prefix found")
  * 
  *     def iterprefixes(self, unicode key):             # <<<<<<<<<<<<<<
  *         '''
@@ -1069,7 +1083,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct__iterprefixes {
 };
 
 
-/* "dawg.pyx":273
+/* "dawg.pyx":291
  * 
  *     @classmethod
  *     def compile_replaces(cls, replaces):             # <<<<<<<<<<<<<<
@@ -1082,7 +1096,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_1_compile_replaces {
 };
 
 
-/* "dawg.pyx":281
+/* "dawg.pyx":299
  *         return dict(
  *             (
  *                 k.encode('utf8'),             # <<<<<<<<<<<<<<
@@ -1097,7 +1111,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_2_genexpr {
 };
 
 
-/* "dawg.pyx":325
+/* "dawg.pyx":343
  *         return res
  * 
  *     def iterkeys(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -1115,7 +1129,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_3_iterkeys {
 };
 
 
-/* "dawg.pyx":473
+/* "dawg.pyx":491
  *     cdef Completer* _completer
  * 
  *     def __init__(self, arg=None, input_is_sorted=False, bytes payload_separator=PAYLOAD_SEPARATOR):             # <<<<<<<<<<<<<<
@@ -1129,7 +1143,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_4___init__ {
 };
 
 
-/* "dawg.pyx":483
+/* "dawg.pyx":501
  *         self._c_payload_separator = <unsigned int>ord(payload_separator)
  * 
  *         keys = (self._raw_key(d[0], d[1]) for d in arg)             # <<<<<<<<<<<<<<
@@ -1146,7 +1160,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_5_genexpr {
 };
 
 
-/* "dawg.pyx":624
+/* "dawg.pyx":642
  *         return res
  * 
  *     def iteritems(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -1172,7 +1186,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_6_iteritems {
 };
 
 
-/* "dawg.pyx":686
+/* "dawg.pyx":704
  *         return res
  * 
  *     def iterkeys(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -1192,7 +1206,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_7_iterkeys {
 };
 
 
-/* "dawg.pyx":824
+/* "dawg.pyx":863
  *     cdef _struct
  * 
  *     def __init__(self, fmt, arg=None, input_is_sorted=False, bytes payload_separator=PAYLOAD_SEPARATOR):             # <<<<<<<<<<<<<<
@@ -1206,7 +1220,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_8___init__ {
 };
 
 
-/* "dawg.pyx":839
+/* "dawg.pyx":878
  *             arg = []
  * 
  *         keys = ((d[0], self._struct.pack(*d[1])) for d in arg)             # <<<<<<<<<<<<<<
@@ -1223,7 +1237,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_9_genexpr {
 };
 
 
-/* "dawg.pyx":850
+/* "dawg.pyx":889
  *         return [(key, self._struct.unpack(val)) for (key, val) in items]
  * 
  *     def iteritems(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -1242,7 +1256,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_10_iteritems {
 };
 
 
-/* "dawg.pyx":855
+/* "dawg.pyx":894
  * 
  * 
  * def _iterable_from_argument(arg):             # <<<<<<<<<<<<<<
@@ -1255,7 +1269,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_11__iterable_from_argument {
 };
 
 
-/* "dawg.pyx":860
+/* "dawg.pyx":899
  * 
  *     if isinstance(arg, Mapping):
  *         return ((key, arg[key]) for key in arg)             # <<<<<<<<<<<<<<
@@ -1272,7 +1286,7 @@ struct __pyx_obj_4dawg___pyx_scope_struct_12_genexpr {
 };
 
 
-/* "dawg.pyx":971
+/* "dawg.pyx":1030
  *         return res
  * 
  *     def iteritems(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -1314,7 +1328,7 @@ struct __pyx_vtabstruct_4dawg_DAWG {
 static struct __pyx_vtabstruct_4dawg_DAWG *__pyx_vtabptr_4dawg_DAWG;
 
 
-/* "dawg.pyx":293
+/* "dawg.pyx":311
  * 
  * 
  * cdef class CompletionDAWG(DAWG):             # <<<<<<<<<<<<<<
@@ -1329,7 +1343,7 @@ struct __pyx_vtabstruct_4dawg_CompletionDAWG {
 static struct __pyx_vtabstruct_4dawg_CompletionDAWG *__pyx_vtabptr_4dawg_CompletionDAWG;
 
 
-/* "dawg.pyx":460
+/* "dawg.pyx":478
  * DEF MAX_VALUE_SIZE = 32768
  * 
  * cdef class BytesDAWG(CompletionDAWG):             # <<<<<<<<<<<<<<
@@ -1355,8 +1369,8 @@ struct __pyx_vtabstruct_4dawg_BytesDAWG {
 static struct __pyx_vtabstruct_4dawg_BytesDAWG *__pyx_vtabptr_4dawg_BytesDAWG;
 
 
-/* "dawg.pyx":807
- * 
+/* "dawg.pyx":846
+ *             raise KeyError("No prefix found")
  * 
  * cdef class RecordDAWG(BytesDAWG):             # <<<<<<<<<<<<<<
  *     """
@@ -1369,7 +1383,7 @@ struct __pyx_vtabstruct_4dawg_RecordDAWG {
 static struct __pyx_vtabstruct_4dawg_RecordDAWG *__pyx_vtabptr_4dawg_RecordDAWG;
 
 
-/* "dawg.pyx":866
+/* "dawg.pyx":905
  * DEF LOOKUP_ERROR = -1
  * 
  * cdef class IntDAWG(DAWG):             # <<<<<<<<<<<<<<
@@ -1386,7 +1400,7 @@ struct __pyx_vtabstruct_4dawg_IntDAWG {
 static struct __pyx_vtabstruct_4dawg_IntDAWG *__pyx_vtabptr_4dawg_IntDAWG;
 
 
-/* "dawg.pyx":909
+/* "dawg.pyx":968
  * 
  * # FIXME: code duplication.
  * cdef class IntCompletionDAWG(CompletionDAWG):             # <<<<<<<<<<<<<<
@@ -1803,6 +1817,10 @@ static CYTHON_INLINE int __Pyx_PyList_Append(PyObject* list, PyObject* x) {
 #define __Pyx_PyList_Append(L,x) PyList_Append(L,x)
 #endif
 
+/* unicode_iter.proto */
+static CYTHON_INLINE int __Pyx_init_unicode_iteration(
+    PyObject* ustring, Py_ssize_t *length, void** data, int *kind);
+
 /* decode_c_string_utf16.proto */
 static CYTHON_INLINE PyObject *__Pyx_PyUnicode_DecodeUTF16(const char *s, Py_ssize_t size, const char *errors) {
     int byteorder = 0;
@@ -2046,6 +2064,9 @@ static CYTHON_INLINE PyObject* __Pyx_PyInt_From_unsigned_char(unsigned char valu
 /* CIntToPy.proto */
 static CYTHON_INLINE PyObject* __Pyx_PyInt_From_long(long value);
 
+/* CIntToPy.proto */
+static CYTHON_INLINE PyObject* __Pyx_PyInt_From_dawgdic_3a__3a_ValueType(dawgdic::ValueType value);
+
 /* CIntFromPy.proto */
 static CYTHON_INLINE int __Pyx_PyInt_As_int(PyObject *);
 
@@ -2273,14 +2294,14 @@ static PyObject *__pyx_builtin_ImportError;
 static PyObject *__pyx_builtin_ValueError;
 static PyObject *__pyx_builtin_IOError;
 static PyObject *__pyx_builtin_open;
+static PyObject *__pyx_builtin_KeyError;
 static PyObject *__pyx_builtin_super;
 static PyObject *__pyx_builtin_range;
-static PyObject *__pyx_builtin_KeyError;
 static const char __pyx_k__2[] = ")";
 static const char __pyx_k__6[] = "";
 static const char __pyx_k_wb[] = "wb";
-static const char __pyx_k__11[] = "')";
-static const char __pyx_k__13[] = "\001";
+static const char __pyx_k__12[] = "')";
+static const char __pyx_k__14[] = "\001";
 static const char __pyx_k_arg[] = "arg";
 static const char __pyx_k_doc[] = "__doc__";
 static const char __pyx_k_fmt[] = "fmt";
@@ -2357,6 +2378,7 @@ static const char __pyx_k_similar_keys[] = "similar_keys";
 static const char __pyx_k_src_dawg_pyx[] = "src/dawg.pyx";
 static const char __pyx_k_similar_items[] = "similar_items";
 static const char __pyx_k_CompletionDAWG[] = "CompletionDAWG";
+static const char __pyx_k_No_prefix_found[] = "No prefix found";
 static const char __pyx_k_collections_abc[] = "collections.abc";
 static const char __pyx_k_input_is_sorted[] = "input_is_sorted";
 static const char __pyx_k_Can_t_insert_key[] = "Can't insert key ";
@@ -2412,14 +2434,15 @@ static PyObject *__pyx_n_s_KeyError;
 static PyObject *__pyx_kp_u_Keys_and_values_must_be_single_c;
 static PyObject *__pyx_n_s_Mapping;
 static PyObject *__pyx_kp_u_Negative_values_are_not_supporte;
+static PyObject *__pyx_kp_u_No_prefix_found;
 static PyObject *__pyx_kp_u_None;
 static PyObject *__pyx_kp_u_Payload_separator;
 static PyObject *__pyx_n_s_RecordDAWG;
 static PyObject *__pyx_n_s_RecordDAWG_iteritems;
 static PyObject *__pyx_n_s_Struct;
 static PyObject *__pyx_n_s_ValueError;
-static PyObject *__pyx_kp_u__11;
-static PyObject *__pyx_kp_b__13;
+static PyObject *__pyx_kp_u__12;
+static PyObject *__pyx_kp_b__14;
 static PyObject *__pyx_kp_u__2;
 static PyObject *__pyx_kp_u__6;
 static PyObject *__pyx_n_s_arg;
@@ -2520,9 +2543,10 @@ static PyObject *__pyx_pf_4dawg_4DAWG_32_file_size(struct __pyx_obj_4dawg_DAWG *
 static PyObject *__pyx_pf_4dawg_4DAWG_34similar_keys(struct __pyx_obj_4dawg_DAWG *__pyx_v_self, PyObject *__pyx_v_key, PyObject *__pyx_v_replaces); /* proto */
 static PyObject *__pyx_pf_4dawg_4DAWG_36prefixes(struct __pyx_obj_4dawg_DAWG *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
 static PyObject *__pyx_pf_4dawg_4DAWG_38b_prefixes(struct __pyx_obj_4dawg_DAWG *__pyx_v_self, PyObject *__pyx_v_b_key); /* proto */
-static PyObject *__pyx_pf_4dawg_4DAWG_40iterprefixes(struct __pyx_obj_4dawg_DAWG *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
+static PyObject *__pyx_pf_4dawg_4DAWG_40longest_prefix(struct __pyx_obj_4dawg_DAWG *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
+static PyObject *__pyx_pf_4dawg_4DAWG_42iterprefixes(struct __pyx_obj_4dawg_DAWG *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
 static PyObject *__pyx_pf_4dawg_4DAWG_16compile_replaces_genexpr(PyObject *__pyx_self); /* proto */
-static PyObject *__pyx_pf_4dawg_4DAWG_43compile_replaces(CYTHON_UNUSED PyTypeObject *__pyx_v_cls, PyObject *__pyx_v_replaces); /* proto */
+static PyObject *__pyx_pf_4dawg_4DAWG_45compile_replaces(CYTHON_UNUSED PyTypeObject *__pyx_v_cls, PyObject *__pyx_v_replaces); /* proto */
 static int __pyx_pf_4dawg_14CompletionDAWG___init__(struct __pyx_obj_4dawg_CompletionDAWG *__pyx_v_self, PyObject *__pyx_v_arg, PyObject *__pyx_v_input_is_sorted); /* proto */
 static void __pyx_pf_4dawg_14CompletionDAWG_2__dealloc__(struct __pyx_obj_4dawg_CompletionDAWG *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_4dawg_14CompletionDAWG_4keys(struct __pyx_obj_4dawg_CompletionDAWG *__pyx_v_self, PyObject *__pyx_v_prefix); /* proto */
@@ -2549,6 +2573,7 @@ static PyObject *__pyx_pf_4dawg_9BytesDAWG_25keys(struct __pyx_obj_4dawg_BytesDA
 static PyObject *__pyx_pf_4dawg_9BytesDAWG_27iterkeys(struct __pyx_obj_4dawg_BytesDAWG *__pyx_v_self, PyObject *__pyx_v_prefix); /* proto */
 static PyObject *__pyx_pf_4dawg_9BytesDAWG_30similar_items(struct __pyx_obj_4dawg_BytesDAWG *__pyx_v_self, PyObject *__pyx_v_key, PyObject *__pyx_v_replaces); /* proto */
 static PyObject *__pyx_pf_4dawg_9BytesDAWG_32similar_item_values(struct __pyx_obj_4dawg_BytesDAWG *__pyx_v_self, PyObject *__pyx_v_key, PyObject *__pyx_v_replaces); /* proto */
+static PyObject *__pyx_pf_4dawg_9BytesDAWG_34longest_prefix(struct __pyx_obj_4dawg_BytesDAWG *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
 static PyObject *__pyx_pf_4dawg_10RecordDAWG_8__init___genexpr(PyObject *__pyx_self); /* proto */
 static int __pyx_pf_4dawg_10RecordDAWG___init__(struct __pyx_obj_4dawg_RecordDAWG *__pyx_v_self, PyObject *__pyx_v_fmt, PyObject *__pyx_v_arg, PyObject *__pyx_v_input_is_sorted, PyObject *__pyx_v_payload_separator); /* proto */
 static PyObject *__pyx_pf_4dawg_10RecordDAWG_2items(struct __pyx_obj_4dawg_RecordDAWG *__pyx_v_self, PyObject *__pyx_v_prefix); /* proto */
@@ -2560,6 +2585,7 @@ static PyObject *__pyx_pf_4dawg_7IntDAWG_2__getitem__(struct __pyx_obj_4dawg_Int
 static PyObject *__pyx_pf_4dawg_7IntDAWG_4get(struct __pyx_obj_4dawg_IntDAWG *__pyx_v_self, PyObject *__pyx_v_key, PyObject *__pyx_v_default); /* proto */
 static PyObject *__pyx_pf_4dawg_7IntDAWG_6get_value(struct __pyx_obj_4dawg_IntDAWG *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
 static PyObject *__pyx_pf_4dawg_7IntDAWG_8b_get_value(struct __pyx_obj_4dawg_IntDAWG *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
+static PyObject *__pyx_pf_4dawg_7IntDAWG_10longest_prefix(struct __pyx_obj_4dawg_IntDAWG *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
 static int __pyx_pf_4dawg_17IntCompletionDAWG___init__(struct __pyx_obj_4dawg_IntCompletionDAWG *__pyx_v_self, PyObject *__pyx_v_arg, PyObject *__pyx_v_input_is_sorted); /* proto */
 static PyObject *__pyx_pf_4dawg_17IntCompletionDAWG_2__getitem__(struct __pyx_obj_4dawg_IntCompletionDAWG *__pyx_v_self, PyObject *__pyx_v_key); /* proto */
 static PyObject *__pyx_pf_4dawg_17IntCompletionDAWG_4get(struct __pyx_obj_4dawg_IntCompletionDAWG *__pyx_v_self, PyObject *__pyx_v_key, PyObject *__pyx_v_default); /* proto */
@@ -2588,8 +2614,8 @@ static PyObject *__pyx_tp_new_4dawg___pyx_scope_struct_11__iterable_from_argumen
 static PyObject *__pyx_tp_new_4dawg___pyx_scope_struct_12_genexpr(PyTypeObject *t, PyObject *a, PyObject *k); /*proto*/
 static PyObject *__pyx_tp_new_4dawg___pyx_scope_struct_13_iteritems(PyTypeObject *t, PyObject *a, PyObject *k); /*proto*/
 static PyObject *__pyx_int_neg_1;
-static PyObject *__pyx_k__10;
-static PyObject *__pyx_k__12;
+static PyObject *__pyx_k__11;
+static PyObject *__pyx_k__13;
 static PyObject *__pyx_tuple_;
 static PyObject *__pyx_tuple__3;
 static PyObject *__pyx_tuple__4;
@@ -2597,8 +2623,9 @@ static PyObject *__pyx_tuple__5;
 static PyObject *__pyx_tuple__7;
 static PyObject *__pyx_tuple__8;
 static PyObject *__pyx_tuple__9;
-static PyObject *__pyx_tuple__14;
-static PyObject *__pyx_codeobj__15;
+static PyObject *__pyx_tuple__10;
+static PyObject *__pyx_tuple__15;
+static PyObject *__pyx_codeobj__16;
 /* Late includes */
 
 /* "dawg.pyx":40
@@ -6381,7 +6408,7 @@ static PyObject *__pyx_f_4dawg_4DAWG_b_prefixes(struct __pyx_obj_4dawg_DAWG *__p
  * 
  *         return res             # <<<<<<<<<<<<<<
  * 
- *     def iterprefixes(self, unicode key):
+ *     def longest_prefix(self, unicode key):
  */
   __Pyx_XDECREF(__pyx_r);
   __Pyx_INCREF(__pyx_v_res);
@@ -6453,25 +6480,255 @@ static PyObject *__pyx_pf_4dawg_4DAWG_38b_prefixes(struct __pyx_obj_4dawg_DAWG *
   __Pyx_RefNannyFinishContext();
   return __pyx_r;
 }
-static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_generator, CYTHON_UNUSED PyThreadState *__pyx_tstate, PyObject *__pyx_sent_value); /* proto */
 
 /* "dawg.pyx":256
  *         return res
  * 
+ *     def longest_prefix(self, unicode key):             # <<<<<<<<<<<<<<
+ *         cdef BaseType index = self.dct.root()
+ *         cdef int pos = 1
+ */
+
+/* Python wrapper */
+static PyObject *__pyx_pw_4dawg_4DAWG_41longest_prefix(PyObject *__pyx_v_self, PyObject *__pyx_v_key); /*proto*/
+static char __pyx_doc_4dawg_4DAWG_40longest_prefix[] = "DAWG.longest_prefix(self, unicode key)";
+static PyObject *__pyx_pw_4dawg_4DAWG_41longest_prefix(PyObject *__pyx_v_self, PyObject *__pyx_v_key) {
+  PyObject *__pyx_r = 0;
+  __Pyx_RefNannyDeclarations
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+  /* function exit code */
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+ */
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+
+  /* "dawg.pyx":258
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+ */
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+ */
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+  /* "dawg.pyx":262
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+ *         for ch in key:             # <<<<<<<<<<<<<<
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+    __pyx_v_ch = __Pyx_PyUnicode_READ(__pyx_t_5, __pyx_t_4, __pyx_t_2);
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+    /* "dawg.pyx":263
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+      /* "dawg.pyx":263
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+      /* "dawg.pyx":266
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+ *             pos += 1
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+ *             pos += 1
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+    }
+
+    /* "dawg.pyx":267
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+ *                 lastpos = pos
+ *             pos += 1             # <<<<<<<<<<<<<<
+ * 
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+ *         if lastpos:             # <<<<<<<<<<<<<<
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+    /* "dawg.pyx":270
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+ *         if lastpos:
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+ *             raise KeyError("No prefix found")
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+      PyErr_SetString(PyExc_TypeError, "'NoneType' object is not subscriptable");
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+    /* "dawg.pyx":269
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+ * 
+ *         if lastpos:             # <<<<<<<<<<<<<<
+ *             return key[:lastpos]
+ *         else:
+ */
+  }
+
+  /* "dawg.pyx":272
+ *             return key[:lastpos]
+ *         else:
+ *             raise KeyError("No prefix found")             # <<<<<<<<<<<<<<
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+ *     def iterprefixes(self, unicode key):
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+    __pyx_t_9 = __Pyx_PyObject_Call(__pyx_builtin_KeyError, __pyx_tuple__7, NULL); if (unlikely(!__pyx_t_9)) __PYX_ERR(0, 272, __pyx_L1_error)
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+  /* "dawg.pyx":256
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+ *     def longest_prefix(self, unicode key):             # <<<<<<<<<<<<<<
+ *         cdef BaseType index = self.dct.root()
+ *         cdef int pos = 1
+ */
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+  /* function exit code */
+  __pyx_L1_error:;
+  __Pyx_XDECREF(__pyx_t_1);
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+  __pyx_r = NULL;
+  __pyx_L0:;
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+  __Pyx_RefNannyFinishContext();
+  return __pyx_r;
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+static PyObject *__pyx_gb_4dawg_4DAWG_44generator(__pyx_CoroutineObject *__pyx_generator, CYTHON_UNUSED PyThreadState *__pyx_tstate, PyObject *__pyx_sent_value); /* proto */
+
+/* "dawg.pyx":274
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+ * 
  *     def iterprefixes(self, unicode key):             # <<<<<<<<<<<<<<
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 /* Python wrapper */
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-static PyObject *__pyx_pw_4dawg_4DAWG_41iterprefixes(PyObject *__pyx_v_self, PyObject *__pyx_v_key) {
+static PyObject *__pyx_pw_4dawg_4DAWG_43iterprefixes(PyObject *__pyx_v_self, PyObject *__pyx_v_key); /*proto*/
+static char __pyx_doc_4dawg_4DAWG_42iterprefixes[] = "DAWG.iterprefixes(self, unicode key)\n\n        Return a generator with keys of this DAWG that are prefixes of the ``key``.\n        ";
+static PyObject *__pyx_pw_4dawg_4DAWG_43iterprefixes(PyObject *__pyx_v_self, PyObject *__pyx_v_key) {
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_key), (&PyUnicode_Type), 1, "key", 1))) __PYX_ERR(0, 274, __pyx_L1_error)
+  __pyx_r = __pyx_pf_4dawg_4DAWG_42iterprefixes(((struct __pyx_obj_4dawg_DAWG *)__pyx_v_self), ((PyObject*)__pyx_v_key));
 
   /* function exit code */
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@@ -6482,7 +6739,7 @@ static PyObject *__pyx_pw_4dawg_4DAWG_41iterprefixes(PyObject *__pyx_v_self, PyO
   return __pyx_r;
 }
 
-static PyObject *__pyx_pf_4dawg_4DAWG_40iterprefixes(struct __pyx_obj_4dawg_DAWG *__pyx_v_self, PyObject *__pyx_v_key) {
+static PyObject *__pyx_pf_4dawg_4DAWG_42iterprefixes(struct __pyx_obj_4dawg_DAWG *__pyx_v_self, PyObject *__pyx_v_key) {
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   __Pyx_RefNannyDeclarations
@@ -6491,7 +6748,7 @@ static PyObject *__pyx_pf_4dawg_4DAWG_40iterprefixes(struct __pyx_obj_4dawg_DAWG
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@@ -6502,7 +6759,7 @@ static PyObject *__pyx_pf_4dawg_4DAWG_40iterprefixes(struct __pyx_obj_4dawg_DAWG
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+    __pyx_CoroutineObject *gen = __Pyx_Generator_New((__pyx_coroutine_body_t) __pyx_gb_4dawg_4DAWG_44generator, NULL, (PyObject *) __pyx_cur_scope, __pyx_n_s_iterprefixes, __pyx_n_s_DAWG_iterprefixes, __pyx_n_s_dawg); if (unlikely(!gen)) __PYX_ERR(0, 274, __pyx_L1_error)
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 }
 
-static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_generator, CYTHON_UNUSED PyThreadState *__pyx_tstate, PyObject *__pyx_sent_value) /* generator body */
+static PyObject *__pyx_gb_4dawg_4DAWG_44generator(__pyx_CoroutineObject *__pyx_generator, CYTHON_UNUSED PyThreadState *__pyx_tstate, PyObject *__pyx_sent_value) /* generator body */
 {
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@@ -6540,9 +6797,9 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
     return NULL;
   }
   __pyx_L3_first_run:;
-  if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 256, __pyx_L1_error)
+  if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 274, __pyx_L1_error)
 
-  /* "dawg.pyx":260
+  /* "dawg.pyx":278
  *         Return a generator with keys of this DAWG that are prefixes of the ``key``.
  *         '''
  *         cdef BaseType index = self.dct.root()             # <<<<<<<<<<<<<<
@@ -6551,7 +6808,7 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
  */
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-  /* "dawg.pyx":261
+  /* "dawg.pyx":279
  *         '''
  *         cdef BaseType index = self.dct.root()
  *         cdef bytes b_key = <bytes>key.encode('utf8')             # <<<<<<<<<<<<<<
@@ -6560,9 +6817,9 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
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+  __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_cur_scope->__pyx_v_key); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 279, __pyx_L1_error)
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@@ -6571,7 +6828,7 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
   __pyx_cur_scope->__pyx_v_b_key = ((PyObject*)__pyx_t_2);
   __pyx_t_2 = 0;
 
-  /* "dawg.pyx":262
+  /* "dawg.pyx":280
  *         cdef BaseType index = self.dct.root()
  *         cdef bytes b_key = <bytes>key.encode('utf8')
  *         cdef int pos = 1             # <<<<<<<<<<<<<<
@@ -6580,7 +6837,7 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
  */
   __pyx_cur_scope->__pyx_v_pos = 1;
 
-  /* "dawg.pyx":265
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  *         cdef CharType ch
  * 
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@@ -6589,7 +6846,7 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
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     PyErr_SetString(PyExc_TypeError, "'NoneType' is not iterable");
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+    __PYX_ERR(0, 283, __pyx_L1_error)
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   __Pyx_INCREF(__pyx_cur_scope->__pyx_v_b_key);
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@@ -6599,7 +6856,7 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
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-    /* "dawg.pyx":266
+    /* "dawg.pyx":284
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  *         for ch in b_key:
  *             if not self.dct.Follow(ch, &index):             # <<<<<<<<<<<<<<
@@ -6609,7 +6866,7 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
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-      /* "dawg.pyx":267
+      /* "dawg.pyx":285
  *         for ch in b_key:
  *             if not self.dct.Follow(ch, &index):
  *                 return             # <<<<<<<<<<<<<<
@@ -6621,7 +6878,7 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
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-      /* "dawg.pyx":266
+      /* "dawg.pyx":284
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  *         for ch in b_key:
  *             if not self.dct.Follow(ch, &index):             # <<<<<<<<<<<<<<
@@ -6630,7 +6887,7 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
  */
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-    /* "dawg.pyx":268
+    /* "dawg.pyx":286
  *             if not self.dct.Follow(ch, &index):
  *                 return
  *             if self._has_value(index):             # <<<<<<<<<<<<<<
@@ -6640,7 +6897,7 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
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-      /* "dawg.pyx":269
+      /* "dawg.pyx":287
  *                 return
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  *                 yield b_key[:pos].decode('utf8')             # <<<<<<<<<<<<<<
@@ -6649,9 +6906,9 @@ static PyObject *__pyx_gb_4dawg_4DAWG_42generator(__pyx_CoroutineObject *__pyx_g
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         PyErr_SetString(PyExc_TypeError, "'NoneType' object is not subscriptable");
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+        __PYX_ERR(0, 287, __pyx_L1_error)
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-      __pyx_t_2 = __Pyx_decode_bytes(__pyx_cur_scope->__pyx_v_b_key, 0, __pyx_cur_scope->__pyx_v_pos, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 269, __pyx_L1_error)
+      __pyx_t_2 = __Pyx_decode_bytes(__pyx_cur_scope->__pyx_v_b_key, 0, __pyx_cur_scope->__pyx_v_pos, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 287, __pyx_L1_error)
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       __pyx_t_6 = __pyx_cur_scope->__pyx_t_3;
       __pyx_t_7 = __pyx_cur_scope->__pyx_t_4;
-      if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 269, __pyx_L1_error)
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-      /* "dawg.pyx":268
+      /* "dawg.pyx":286
  *             if not self.dct.Follow(ch, &index):
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  */
     }
 
-    /* "dawg.pyx":270
+    /* "dawg.pyx":288
  *             if self._has_value(index):
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-  /* "dawg.pyx":344
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-  __pyx_t_8 = __Pyx_PyObject_AsWritableString(__pyx_v_path); if (unlikely((!__pyx_t_8) && PyErr_Occurred())) __PYX_ERR(0, 396, __pyx_L1_error)
+  __pyx_t_8 = __Pyx_PyObject_AsWritableString(__pyx_v_path); if (unlikely((!__pyx_t_8) && PyErr_Occurred())) __PYX_ERR(0, 414, __pyx_L1_error)
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+    __PYX_ERR(0, 414, __pyx_L1_error)
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-  /* "dawg.pyx":397
+  /* "dawg.pyx":415
  *         cdef ifstream stream
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  *         if stream.fail():             # <<<<<<<<<<<<<<
@@ -9009,25 +9266,25 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
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     __Pyx_CppExn2PyErr();
-    __PYX_ERR(0, 397, __pyx_L1_error)
+    __PYX_ERR(0, 415, __pyx_L1_error)
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-    /* "dawg.pyx":398
+    /* "dawg.pyx":416
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-    __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_IOError, __pyx_tuple__4, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 398, __pyx_L1_error)
+    __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_IOError, __pyx_tuple__4, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 416, __pyx_L1_error)
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     __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
-    __PYX_ERR(0, 398, __pyx_L1_error)
+    __PYX_ERR(0, 416, __pyx_L1_error)
 
-    /* "dawg.pyx":397
+    /* "dawg.pyx":415
  *         cdef ifstream stream
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@@ -9036,7 +9293,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
  */
   }
 
-  /* "dawg.pyx":400
+  /* "dawg.pyx":418
  *             raise IOError("It's not possible to read file stream")
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  *         try:             # <<<<<<<<<<<<<<
@@ -9045,7 +9302,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
  */
   /*try:*/ {
 
-    /* "dawg.pyx":401
+    /* "dawg.pyx":419
  * 
  *         try:
  *             res = self.dct.Read(<istream*> &stream)             # <<<<<<<<<<<<<<
@@ -9056,11 +9313,11 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
       __pyx_t_2 = __pyx_v_self->__pyx_base.dct.Read(((std::istream *)(&__pyx_v_stream)));
     } catch(...) {
       __Pyx_CppExn2PyErr();
-      __PYX_ERR(0, 401, __pyx_L6_error)
+      __PYX_ERR(0, 419, __pyx_L6_error)
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     __pyx_v_res = __pyx_t_2;
 
-    /* "dawg.pyx":402
+    /* "dawg.pyx":420
  *         try:
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@@ -9070,7 +9327,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
     __pyx_t_2 = ((!(__pyx_v_res != 0)) != 0);
     if (unlikely(__pyx_t_2)) {
 
-      /* "dawg.pyx":403
+      /* "dawg.pyx":421
  *             res = self.dct.Read(<istream*> &stream)
  *             if not res:
  *                 self.dct.Clear()             # <<<<<<<<<<<<<<
@@ -9079,20 +9336,20 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
  */
       __pyx_v_self->__pyx_base.dct.Clear();
 
-      /* "dawg.pyx":404
+      /* "dawg.pyx":422
  *             if not res:
  *                 self.dct.Clear()
  *                 raise IOError("Invalid data format: can't load _dawg.Dictionary")             # <<<<<<<<<<<<<<
  * 
  *             res = self.guide.Read(<istream*> &stream)
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-      __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_IOError, __pyx_tuple__8, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 404, __pyx_L6_error)
+      __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_IOError, __pyx_tuple__9, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 422, __pyx_L6_error)
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       __Pyx_Raise(__pyx_t_3, 0, 0, 0);
       __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
-      __PYX_ERR(0, 404, __pyx_L6_error)
+      __PYX_ERR(0, 422, __pyx_L6_error)
 
-      /* "dawg.pyx":402
+      /* "dawg.pyx":420
  *         try:
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  *             if not res:             # <<<<<<<<<<<<<<
@@ -9101,7 +9358,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
  */
     }
 
-    /* "dawg.pyx":406
+    /* "dawg.pyx":424
  *                 raise IOError("Invalid data format: can't load _dawg.Dictionary")
  * 
  *             res = self.guide.Read(<istream*> &stream)             # <<<<<<<<<<<<<<
@@ -9110,7 +9367,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
  */
     __pyx_v_res = __pyx_v_self->guide.Read(((std::istream *)(&__pyx_v_stream)));
 
-    /* "dawg.pyx":407
+    /* "dawg.pyx":425
  * 
  *             res = self.guide.Read(<istream*> &stream)
  *             if not res:             # <<<<<<<<<<<<<<
@@ -9120,7 +9377,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
     __pyx_t_2 = ((!(__pyx_v_res != 0)) != 0);
     if (unlikely(__pyx_t_2)) {
 
-      /* "dawg.pyx":408
+      /* "dawg.pyx":426
  *             res = self.guide.Read(<istream*> &stream)
  *             if not res:
  *                 self.guide.Clear()             # <<<<<<<<<<<<<<
@@ -9129,7 +9386,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
  */
       __pyx_v_self->guide.Clear();
 
-      /* "dawg.pyx":409
+      /* "dawg.pyx":427
  *             if not res:
  *                 self.guide.Clear()
  *                 self.dct.Clear()             # <<<<<<<<<<<<<<
@@ -9138,20 +9395,20 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
  */
       __pyx_v_self->__pyx_base.dct.Clear();
 
-      /* "dawg.pyx":410
+      /* "dawg.pyx":428
  *                 self.guide.Clear()
  *                 self.dct.Clear()
  *                 raise IOError("Invalid data format: can't load _dawg.Guide")             # <<<<<<<<<<<<<<
  * 
  *         finally:
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-      __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_IOError, __pyx_tuple__9, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 410, __pyx_L6_error)
+      __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_IOError, __pyx_tuple__10, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 428, __pyx_L6_error)
       __Pyx_GOTREF(__pyx_t_3);
       __Pyx_Raise(__pyx_t_3, 0, 0, 0);
       __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
-      __PYX_ERR(0, 410, __pyx_L6_error)
+      __PYX_ERR(0, 428, __pyx_L6_error)
 
-      /* "dawg.pyx":407
+      /* "dawg.pyx":425
  * 
  *             res = self.guide.Read(<istream*> &stream)
  *             if not res:             # <<<<<<<<<<<<<<
@@ -9161,7 +9418,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
     }
   }
 
-  /* "dawg.pyx":413
+  /* "dawg.pyx":431
  * 
  *         finally:
  *             stream.close()             # <<<<<<<<<<<<<<
@@ -9174,7 +9431,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
         __pyx_v_stream.close();
       } catch(...) {
         __Pyx_CppExn2PyErr();
-        __PYX_ERR(0, 413, __pyx_L1_error)
+        __PYX_ERR(0, 431, __pyx_L1_error)
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       goto __pyx_L7;
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@@ -9202,7 +9459,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
           __pyx_v_stream.close();
         } catch(...) {
           __Pyx_CppExn2PyErr();
-          __PYX_ERR(0, 413, __pyx_L11_error)
+          __PYX_ERR(0, 431, __pyx_L11_error)
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       if (PY_MAJOR_VERSION >= 3) {
@@ -9234,7 +9491,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
     __pyx_L7:;
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-  /* "dawg.pyx":415
+  /* "dawg.pyx":433
  *             stream.close()
  * 
  *         return self             # <<<<<<<<<<<<<<
@@ -9246,7 +9503,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
   __pyx_r = ((PyObject *)__pyx_v_self);
   goto __pyx_L0;
 
-  /* "dawg.pyx":388
+  /* "dawg.pyx":406
  *         return self
  * 
  *     def load(self, path):             # <<<<<<<<<<<<<<
@@ -9270,7 +9527,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_15load(struct __pyx_obj_4dawg_C
   return __pyx_r;
 }
 
-/* "dawg.pyx":417
+/* "dawg.pyx":435
  *         return self
  * 
  *     def _transitions(self):             # <<<<<<<<<<<<<<
@@ -9312,19 +9569,19 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
   int __pyx_t_9;
   __Pyx_RefNannySetupContext("_transitions", 0);
 
-  /* "dawg.pyx":418
+  /* "dawg.pyx":436
  * 
  *     def _transitions(self):
  *         transitions = set()             # <<<<<<<<<<<<<<
  *         cdef BaseType index, prev_index, completer_index
  *         cdef char* key
  */
-  __pyx_t_1 = PySet_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 418, __pyx_L1_error)
+  __pyx_t_1 = PySet_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 436, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_transitions = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "dawg.pyx":423
+  /* "dawg.pyx":441
  * 
  *         cdef Completer completer
  *         init_completer(completer, self.dct, self.guide)             # <<<<<<<<<<<<<<
@@ -9333,7 +9590,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
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   __pyx_f_4dawg_init_completer(__pyx_v_completer, __pyx_v_self->__pyx_base.dct, __pyx_v_self->guide);
 
-  /* "dawg.pyx":424
+  /* "dawg.pyx":442
  *         cdef Completer completer
  *         init_completer(completer, self.dct, self.guide)
  *         completer.Start(self.dct.root())             # <<<<<<<<<<<<<<
@@ -9342,7 +9599,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
  */
   __pyx_v_completer.Start(__pyx_v_self->__pyx_base.dct.root());
 
-  /* "dawg.pyx":426
+  /* "dawg.pyx":444
  *         completer.Start(self.dct.root())
  * 
  *         while completer.Next():             # <<<<<<<<<<<<<<
@@ -9353,7 +9610,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
     __pyx_t_2 = (__pyx_v_completer.Next() != 0);
     if (!__pyx_t_2) break;
 
-    /* "dawg.pyx":427
+    /* "dawg.pyx":445
  * 
  *         while completer.Next():
  *             key = <char*>completer.key()             # <<<<<<<<<<<<<<
@@ -9362,7 +9619,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
  */
     __pyx_v_key = ((char *)__pyx_v_completer.key());
 
-    /* "dawg.pyx":429
+    /* "dawg.pyx":447
  *             key = <char*>completer.key()
  * 
  *             index = self.dct.root()             # <<<<<<<<<<<<<<
@@ -9371,7 +9628,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
  */
     __pyx_v_index = __pyx_v_self->__pyx_base.dct.root();
 
-    /* "dawg.pyx":431
+    /* "dawg.pyx":449
  *             index = self.dct.root()
  * 
  *             for i in range(completer.length()):             # <<<<<<<<<<<<<<
@@ -9383,7 +9640,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
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       __pyx_v_i = __pyx_t_5;
 
-      /* "dawg.pyx":432
+      /* "dawg.pyx":450
  * 
  *             for i in range(completer.length()):
  *                 prev_index = index             # <<<<<<<<<<<<<<
@@ -9392,7 +9649,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
  */
       __pyx_v_prev_index = __pyx_v_index;
 
-      /* "dawg.pyx":433
+      /* "dawg.pyx":451
  *             for i in range(completer.length()):
  *                 prev_index = index
  *                 self.dct.Follow(&(key[i]), 1, &index)             # <<<<<<<<<<<<<<
@@ -9401,20 +9658,20 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
  */
       (void)(__pyx_v_self->__pyx_base.dct.Follow((&(__pyx_v_key[__pyx_v_i])), 1, (&__pyx_v_index)));
 
-      /* "dawg.pyx":435
+      /* "dawg.pyx":453
  *                 self.dct.Follow(&(key[i]), 1, &index)
  *                 transitions.add(
  *                     (prev_index, <unsigned char>key[i], index)             # <<<<<<<<<<<<<<
  *                 )
  * 
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-      __pyx_t_1 = __Pyx_PyInt_From_dawgdic_3a__3a_BaseType(__pyx_v_prev_index); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 435, __pyx_L1_error)
+      __pyx_t_1 = __Pyx_PyInt_From_dawgdic_3a__3a_BaseType(__pyx_v_prev_index); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 453, __pyx_L1_error)
       __Pyx_GOTREF(__pyx_t_1);
-      __pyx_t_6 = __Pyx_PyInt_From_unsigned_char(((unsigned char)(__pyx_v_key[__pyx_v_i]))); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 435, __pyx_L1_error)
+      __pyx_t_6 = __Pyx_PyInt_From_unsigned_char(((unsigned char)(__pyx_v_key[__pyx_v_i]))); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 453, __pyx_L1_error)
       __Pyx_GOTREF(__pyx_t_6);
-      __pyx_t_7 = __Pyx_PyInt_From_dawgdic_3a__3a_BaseType(__pyx_v_index); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 435, __pyx_L1_error)
+      __pyx_t_7 = __Pyx_PyInt_From_dawgdic_3a__3a_BaseType(__pyx_v_index); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 453, __pyx_L1_error)
       __Pyx_GOTREF(__pyx_t_7);
-      __pyx_t_8 = PyTuple_New(3); if (unlikely(!__pyx_t_8)) __PYX_ERR(0, 435, __pyx_L1_error)
+      __pyx_t_8 = PyTuple_New(3); if (unlikely(!__pyx_t_8)) __PYX_ERR(0, 453, __pyx_L1_error)
       __Pyx_GOTREF(__pyx_t_8);
       __Pyx_GIVEREF(__pyx_t_1);
       PyTuple_SET_ITEM(__pyx_t_8, 0, __pyx_t_1);
@@ -9426,19 +9683,19 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
       __pyx_t_6 = 0;
       __pyx_t_7 = 0;
 
-      /* "dawg.pyx":434
+      /* "dawg.pyx":452
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  *                 self.dct.Follow(&(key[i]), 1, &index)
  *                 transitions.add(             # <<<<<<<<<<<<<<
  *                     (prev_index, <unsigned char>key[i], index)
  *                 )
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-      __pyx_t_9 = PySet_Add(__pyx_v_transitions, __pyx_t_8); if (unlikely(__pyx_t_9 == ((int)-1))) __PYX_ERR(0, 434, __pyx_L1_error)
+      __pyx_t_9 = PySet_Add(__pyx_v_transitions, __pyx_t_8); if (unlikely(__pyx_t_9 == ((int)-1))) __PYX_ERR(0, 452, __pyx_L1_error)
       __Pyx_DECREF(__pyx_t_8); __pyx_t_8 = 0;
     }
   }
 
-  /* "dawg.pyx":438
+  /* "dawg.pyx":456
  *                 )
  * 
  *         return sorted(list(transitions))             # <<<<<<<<<<<<<<
@@ -9446,19 +9703,19 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
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  */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_7 = PySequence_List(__pyx_v_transitions); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 438, __pyx_L1_error)
+  __pyx_t_7 = PySequence_List(__pyx_v_transitions); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 456, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_7);
-  __pyx_t_6 = PySequence_List(__pyx_t_7); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 438, __pyx_L1_error)
+  __pyx_t_6 = PySequence_List(__pyx_t_7); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 456, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_6);
   __Pyx_DECREF(__pyx_t_7); __pyx_t_7 = 0;
   __pyx_t_8 = ((PyObject*)__pyx_t_6);
   __pyx_t_6 = 0;
-  __pyx_t_9 = PyList_Sort(__pyx_t_8); if (unlikely(__pyx_t_9 == ((int)-1))) __PYX_ERR(0, 438, __pyx_L1_error)
+  __pyx_t_9 = PyList_Sort(__pyx_t_8); if (unlikely(__pyx_t_9 == ((int)-1))) __PYX_ERR(0, 456, __pyx_L1_error)
   __pyx_r = __pyx_t_8;
   __pyx_t_8 = 0;
   goto __pyx_L0;
 
-  /* "dawg.pyx":417
+  /* "dawg.pyx":435
  *         return self
  * 
  *     def _transitions(self):             # <<<<<<<<<<<<<<
@@ -9481,7 +9738,7 @@ static PyObject *__pyx_pf_4dawg_14CompletionDAWG_17_transitions(struct __pyx_obj
   return __pyx_r;
 }
 
-/* "dawg.pyx":473
+/* "dawg.pyx":491
  *     cdef Completer* _completer
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  *     def __init__(self, arg=None, input_is_sorted=False, bytes payload_separator=PAYLOAD_SEPARATOR):             # <<<<<<<<<<<<<<
@@ -9507,7 +9764,7 @@ static int __pyx_pw_4dawg_9BytesDAWG_1__init__(PyObject *__pyx_v_self, PyObject
     PyObject* values[3] = {0,0,0};
     values[0] = ((PyObject *)Py_None);
     values[1] = ((PyObject *)Py_False);
-    values[2] = __pyx_k__10;
+    values[2] = __pyx_k__11;
     if (unlikely(__pyx_kwds)) {
       Py_ssize_t kw_args;
       const Py_ssize_t pos_args = PyTuple_GET_SIZE(__pyx_args);
@@ -9542,7 +9799,7 @@ static int __pyx_pw_4dawg_9BytesDAWG_1__init__(PyObject *__pyx_v_self, PyObject
         }
       }
       if (unlikely(kw_args > 0)) {
-        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "__init__") < 0)) __PYX_ERR(0, 473, __pyx_L3_error)
+        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "__init__") < 0)) __PYX_ERR(0, 491, __pyx_L3_error)
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     } else {
       switch (PyTuple_GET_SIZE(__pyx_args)) {
@@ -9562,13 +9819,13 @@ static int __pyx_pw_4dawg_9BytesDAWG_1__init__(PyObject *__pyx_v_self, PyObject
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+        if (!(likely(PyList_CheckExact(__pyx_t_2))||((__pyx_t_2) == Py_None)||(PyErr_Format(PyExc_TypeError, "Expected %.16s, got %.200s", "list", Py_TYPE(__pyx_t_2)->tp_name), 0))) __PYX_ERR(0, 600, __pyx_L1_error)
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     #endif
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-  __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_v_prefix); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 583, __pyx_L1_error)
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-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 586, __pyx_L1_error)
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-  /* "dawg.pyx":591
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-  /* "dawg.pyx":592
+  /* "dawg.pyx":610
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  *         cdef BaseType index = self.dct.root()
  *         if not self.dct.Follow(b_prefix, &index):             # <<<<<<<<<<<<<<
@@ -11984,13 +12241,13 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
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     PyErr_SetString(PyExc_TypeError, "expected bytes, NoneType found");
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-  __pyx_t_5 = __Pyx_PyBytes_AsWritableString(__pyx_v_b_prefix); if (unlikely((!__pyx_t_5) && PyErr_Occurred())) __PYX_ERR(0, 592, __pyx_L1_error)
+  __pyx_t_5 = __Pyx_PyBytes_AsWritableString(__pyx_v_b_prefix); if (unlikely((!__pyx_t_5) && PyErr_Occurred())) __PYX_ERR(0, 610, __pyx_L1_error)
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-    /* "dawg.pyx":593
+    /* "dawg.pyx":611
  *         cdef BaseType index = self.dct.root()
  *         if not self.dct.Follow(b_prefix, &index):
  *             return res             # <<<<<<<<<<<<<<
@@ -12002,7 +12259,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
     __pyx_r = __pyx_v_res;
     goto __pyx_L0;
 
-    /* "dawg.pyx":592
+    /* "dawg.pyx":610
  * 
  *         cdef BaseType index = self.dct.root()
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@@ -12011,7 +12268,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
  */
   }
 
-  /* "dawg.pyx":600
+  /* "dawg.pyx":618
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  *         cdef Completer completer
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@@ -12020,7 +12277,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
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   __pyx_f_4dawg_init_completer(__pyx_v_completer, __pyx_v_self->__pyx_base.__pyx_base.dct, __pyx_v_self->__pyx_base.guide);
 
-  /* "dawg.pyx":601
+  /* "dawg.pyx":619
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@@ -12029,12 +12286,12 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
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+    __PYX_ERR(0, 619, __pyx_L1_error)
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-  __pyx_t_7 = __Pyx_PyBytes_AsWritableString(__pyx_v_b_prefix); if (unlikely((!__pyx_t_7) && PyErr_Occurred())) __PYX_ERR(0, 601, __pyx_L1_error)
+  __pyx_t_7 = __Pyx_PyBytes_AsWritableString(__pyx_v_b_prefix); if (unlikely((!__pyx_t_7) && PyErr_Occurred())) __PYX_ERR(0, 619, __pyx_L1_error)
   __pyx_v_completer.Start(__pyx_v_index, __pyx_t_7);
 
-  /* "dawg.pyx":603
+  /* "dawg.pyx":621
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  * 
  *         while completer.Next():             # <<<<<<<<<<<<<<
@@ -12045,7 +12302,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
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-    /* "dawg.pyx":604
+    /* "dawg.pyx":622
  * 
  *         while completer.Next():
  *             raw_key = <char*>completer.key()             # <<<<<<<<<<<<<<
@@ -12054,7 +12311,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
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-    /* "dawg.pyx":606
+    /* "dawg.pyx":624
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  *             for i in range(0, completer.length()):             # <<<<<<<<<<<<<<
@@ -12066,7 +12323,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
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-      /* "dawg.pyx":607
+      /* "dawg.pyx":625
  * 
  *             for i in range(0, completer.length()):
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@@ -12076,7 +12333,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
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-        /* "dawg.pyx":608
+        /* "dawg.pyx":626
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@@ -12085,7 +12342,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
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-        /* "dawg.pyx":607
+        /* "dawg.pyx":625
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  *             for i in range(0, completer.length()):
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@@ -12096,7 +12353,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
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-    /* "dawg.pyx":610
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  *             raw_value = &(raw_key[i])             # <<<<<<<<<<<<<<
@@ -12105,7 +12362,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
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-    /* "dawg.pyx":611
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-    /* "dawg.pyx":613
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-    /* "dawg.pyx":614
+    /* "dawg.pyx":632
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-    /* "dawg.pyx":615
+    /* "dawg.pyx":633
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  *             u_key = raw_key[:i].decode('utf8')
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-    __pyx_t_1 = __Pyx_PyBytes_FromStringAndSize(((const char*)__pyx_v__b64_decoder_storage) + 0, __pyx_v__len - 0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 615, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_PyBytes_FromStringAndSize(((const char*)__pyx_v__b64_decoder_storage) + 0, __pyx_v__len - 0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 633, __pyx_L1_error)
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-    /* "dawg.pyx":617
+    /* "dawg.pyx":635
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-    __pyx_t_1 = __Pyx_decode_c_string(__pyx_v_raw_key, 0, __pyx_v_i, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 617, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_decode_c_string(__pyx_v_raw_key, 0, __pyx_v_i, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 635, __pyx_L1_error)
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-    /* "dawg.pyx":619
+    /* "dawg.pyx":637
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  * 
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-    __pyx_t_1 = PyTuple_New(2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 619, __pyx_L1_error)
+    __pyx_t_1 = PyTuple_New(2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 637, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
     __Pyx_INCREF(__pyx_v_u_key);
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@@ -12172,18 +12429,18 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_items(struct __pyx_obj_4dawg_BytesDAWG
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-    /* "dawg.pyx":618
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+    __pyx_t_11 = __Pyx_PyList_Append(__pyx_v_res, __pyx_t_1); if (unlikely(__pyx_t_11 == ((int)-1))) __PYX_ERR(0, 636, __pyx_L1_error)
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-  /* "dawg.pyx":622
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-  /* "dawg.pyx":582
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+        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "items") < 0)) __PYX_ERR(0, 600, __pyx_L3_error)
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@@ -12265,13 +12522,13 @@ static PyObject *__pyx_pw_4dawg_9BytesDAWG_21items(PyObject *__pyx_v_self, PyObj
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_prefix), (&PyUnicode_Type), 1, "prefix", 1))) __PYX_ERR(0, 600, __pyx_L1_error)
   __pyx_r = __pyx_pf_4dawg_9BytesDAWG_20items(((struct __pyx_obj_4dawg_BytesDAWG *)__pyx_v_self), __pyx_v_prefix);
 
   /* function exit code */
@@ -12292,7 +12549,7 @@ static PyObject *__pyx_pf_4dawg_9BytesDAWG_20items(struct __pyx_obj_4dawg_BytesD
   __Pyx_XDECREF(__pyx_r);
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   __pyx_t_2.prefix = __pyx_v_prefix;
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+  __pyx_t_1 = __pyx_vtabptr_4dawg_BytesDAWG->items(__pyx_v_self, 1, &__pyx_t_2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 600, __pyx_L1_error)
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@@ -12310,7 +12567,7 @@ static PyObject *__pyx_pf_4dawg_9BytesDAWG_20items(struct __pyx_obj_4dawg_BytesD
 }
 static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *__pyx_generator, CYTHON_UNUSED PyThreadState *__pyx_tstate, PyObject *__pyx_sent_value); /* proto */
 
-/* "dawg.pyx":624
+/* "dawg.pyx":642
  *         return res
  * 
  *     def iteritems(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -12348,7 +12605,7 @@ static PyObject *__pyx_pw_4dawg_9BytesDAWG_23iteritems(PyObject *__pyx_v_self, P
         }
       }
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-        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "iteritems") < 0)) __PYX_ERR(0, 624, __pyx_L3_error)
+        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "iteritems") < 0)) __PYX_ERR(0, 642, __pyx_L3_error)
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@@ -12362,13 +12619,13 @@ static PyObject *__pyx_pw_4dawg_9BytesDAWG_23iteritems(PyObject *__pyx_v_self, P
   }
   goto __pyx_L4_argument_unpacking_done;
   __pyx_L5_argtuple_error:;
-  __Pyx_RaiseArgtupleInvalid("iteritems", 0, 0, 1, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 624, __pyx_L3_error)
+  __Pyx_RaiseArgtupleInvalid("iteritems", 0, 0, 1, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 642, __pyx_L3_error)
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   return NULL;
   __pyx_L4_argument_unpacking_done:;
-  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_prefix), (&PyUnicode_Type), 1, "prefix", 1))) __PYX_ERR(0, 624, __pyx_L1_error)
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_prefix), (&PyUnicode_Type), 1, "prefix", 1))) __PYX_ERR(0, 642, __pyx_L1_error)
   __pyx_r = __pyx_pf_4dawg_9BytesDAWG_22iteritems(((struct __pyx_obj_4dawg_BytesDAWG *)__pyx_v_self), __pyx_v_prefix);
 
   /* function exit code */
@@ -12389,7 +12646,7 @@ static PyObject *__pyx_pf_4dawg_9BytesDAWG_22iteritems(struct __pyx_obj_4dawg_By
   if (unlikely(!__pyx_cur_scope)) {
     __pyx_cur_scope = ((struct __pyx_obj_4dawg___pyx_scope_struct_6_iteritems *)Py_None);
     __Pyx_INCREF(Py_None);
-    __PYX_ERR(0, 624, __pyx_L1_error)
+    __PYX_ERR(0, 642, __pyx_L1_error)
   } else {
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@@ -12400,7 +12657,7 @@ static PyObject *__pyx_pf_4dawg_9BytesDAWG_22iteritems(struct __pyx_obj_4dawg_By
   __Pyx_INCREF(__pyx_cur_scope->__pyx_v_prefix);
   __Pyx_GIVEREF(__pyx_cur_scope->__pyx_v_prefix);
   {
-    __pyx_CoroutineObject *gen = __Pyx_Generator_New((__pyx_coroutine_body_t) __pyx_gb_4dawg_9BytesDAWG_24generator2, NULL, (PyObject *) __pyx_cur_scope, __pyx_n_s_iteritems, __pyx_n_s_BytesDAWG_iteritems, __pyx_n_s_dawg); if (unlikely(!gen)) __PYX_ERR(0, 624, __pyx_L1_error)
+    __pyx_CoroutineObject *gen = __Pyx_Generator_New((__pyx_coroutine_body_t) __pyx_gb_4dawg_9BytesDAWG_24generator2, NULL, (PyObject *) __pyx_cur_scope, __pyx_n_s_iteritems, __pyx_n_s_BytesDAWG_iteritems, __pyx_n_s_dawg); if (unlikely(!gen)) __PYX_ERR(0, 642, __pyx_L1_error)
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@@ -12437,9 +12694,9 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
     return NULL;
   }
   __pyx_L3_first_run:;
-  if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 624, __pyx_L1_error)
+  if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 642, __pyx_L1_error)
 
-  /* "dawg.pyx":625
+  /* "dawg.pyx":643
  * 
  *     def iteritems(self, unicode prefix=""):
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@@ -12448,15 +12705,15 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
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   if (unlikely(__pyx_cur_scope->__pyx_v_prefix == Py_None)) {
     PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "encode");
-    __PYX_ERR(0, 625, __pyx_L1_error)
+    __PYX_ERR(0, 643, __pyx_L1_error)
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-  __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_cur_scope->__pyx_v_prefix); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 625, __pyx_L1_error)
+  __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_cur_scope->__pyx_v_prefix); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 643, __pyx_L1_error)
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   __pyx_cur_scope->__pyx_v_b_prefix = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "dawg.pyx":632
+  /* "dawg.pyx":650
  *         cdef int raw_value_len
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  *         cdef BaseType index = self.dct.root()             # <<<<<<<<<<<<<<
@@ -12465,7 +12722,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
  */
   __pyx_cur_scope->__pyx_v_index = __pyx_cur_scope->__pyx_v_self->__pyx_base.__pyx_base.dct.root();
 
-  /* "dawg.pyx":633
+  /* "dawg.pyx":651
  * 
  *         cdef BaseType index = self.dct.root()
  *         if not self.dct.Follow(b_prefix, &index):             # <<<<<<<<<<<<<<
@@ -12474,13 +12731,13 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
  */
   if (unlikely(__pyx_cur_scope->__pyx_v_b_prefix == Py_None)) {
     PyErr_SetString(PyExc_TypeError, "expected bytes, NoneType found");
-    __PYX_ERR(0, 633, __pyx_L1_error)
+    __PYX_ERR(0, 651, __pyx_L1_error)
   }
-  __pyx_t_2 = __Pyx_PyBytes_AsWritableString(__pyx_cur_scope->__pyx_v_b_prefix); if (unlikely((!__pyx_t_2) && PyErr_Occurred())) __PYX_ERR(0, 633, __pyx_L1_error)
+  __pyx_t_2 = __Pyx_PyBytes_AsWritableString(__pyx_cur_scope->__pyx_v_b_prefix); if (unlikely((!__pyx_t_2) && PyErr_Occurred())) __PYX_ERR(0, 651, __pyx_L1_error)
   __pyx_t_3 = ((!(__pyx_cur_scope->__pyx_v_self->__pyx_base.__pyx_base.dct.Follow(__pyx_t_2, (&__pyx_cur_scope->__pyx_v_index)) != 0)) != 0);
   if (__pyx_t_3) {
 
-    /* "dawg.pyx":634
+    /* "dawg.pyx":652
  *         cdef BaseType index = self.dct.root()
  *         if not self.dct.Follow(b_prefix, &index):
  *             return             # <<<<<<<<<<<<<<
@@ -12491,7 +12748,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
     __pyx_r = NULL;
     goto __pyx_L0;
 
-    /* "dawg.pyx":633
+    /* "dawg.pyx":651
  * 
  *         cdef BaseType index = self.dct.root()
  *         if not self.dct.Follow(b_prefix, &index):             # <<<<<<<<<<<<<<
@@ -12500,7 +12757,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
  */
   }
 
-  /* "dawg.pyx":641
+  /* "dawg.pyx":659
  * 
  *         cdef Completer completer
  *         init_completer(completer, self.dct, self.guide)             # <<<<<<<<<<<<<<
@@ -12509,7 +12766,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
  */
   __pyx_f_4dawg_init_completer(__pyx_cur_scope->__pyx_v_completer, __pyx_cur_scope->__pyx_v_self->__pyx_base.__pyx_base.dct, __pyx_cur_scope->__pyx_v_self->__pyx_base.guide);
 
-  /* "dawg.pyx":642
+  /* "dawg.pyx":660
  *         cdef Completer completer
  *         init_completer(completer, self.dct, self.guide)
  *         completer.Start(index, b_prefix)             # <<<<<<<<<<<<<<
@@ -12518,12 +12775,12 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
  */
   if (unlikely(__pyx_cur_scope->__pyx_v_b_prefix == Py_None)) {
     PyErr_SetString(PyExc_TypeError, "expected bytes, NoneType found");
-    __PYX_ERR(0, 642, __pyx_L1_error)
+    __PYX_ERR(0, 660, __pyx_L1_error)
   }
-  __pyx_t_4 = __Pyx_PyBytes_AsWritableString(__pyx_cur_scope->__pyx_v_b_prefix); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 642, __pyx_L1_error)
+  __pyx_t_4 = __Pyx_PyBytes_AsWritableString(__pyx_cur_scope->__pyx_v_b_prefix); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 660, __pyx_L1_error)
   __pyx_cur_scope->__pyx_v_completer.Start(__pyx_cur_scope->__pyx_v_index, __pyx_t_4);
 
-  /* "dawg.pyx":644
+  /* "dawg.pyx":662
  *         completer.Start(index, b_prefix)
  * 
  *         while completer.Next():             # <<<<<<<<<<<<<<
@@ -12534,7 +12791,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
     __pyx_t_3 = (__pyx_cur_scope->__pyx_v_completer.Next() != 0);
     if (!__pyx_t_3) break;
 
-    /* "dawg.pyx":645
+    /* "dawg.pyx":663
  * 
  *         while completer.Next():
  *             raw_key = <char*>completer.key()             # <<<<<<<<<<<<<<
@@ -12543,7 +12800,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
  */
     __pyx_cur_scope->__pyx_v_raw_key = ((char *)__pyx_cur_scope->__pyx_v_completer.key());
 
-    /* "dawg.pyx":647
+    /* "dawg.pyx":665
  *             raw_key = <char*>completer.key()
  * 
  *             for i in range(0, completer.length()):             # <<<<<<<<<<<<<<
@@ -12555,7 +12812,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
     for (__pyx_t_7 = 0; __pyx_t_7 < __pyx_t_6; __pyx_t_7+=1) {
       __pyx_cur_scope->__pyx_v_i = __pyx_t_7;
 
-      /* "dawg.pyx":648
+      /* "dawg.pyx":666
  * 
  *             for i in range(0, completer.length()):
  *                 if raw_key[i] == self._c_payload_separator:             # <<<<<<<<<<<<<<
@@ -12565,7 +12822,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
       __pyx_t_3 = (((__pyx_cur_scope->__pyx_v_raw_key[__pyx_cur_scope->__pyx_v_i]) == __pyx_cur_scope->__pyx_v_self->_c_payload_separator) != 0);
       if (__pyx_t_3) {
 
-        /* "dawg.pyx":649
+        /* "dawg.pyx":667
  *             for i in range(0, completer.length()):
  *                 if raw_key[i] == self._c_payload_separator:
  *                     break             # <<<<<<<<<<<<<<
@@ -12574,7 +12831,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
  */
         goto __pyx_L8_break;
 
-        /* "dawg.pyx":648
+        /* "dawg.pyx":666
  * 
  *             for i in range(0, completer.length()):
  *                 if raw_key[i] == self._c_payload_separator:             # <<<<<<<<<<<<<<
@@ -12585,7 +12842,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
     }
     __pyx_L8_break:;
 
-    /* "dawg.pyx":651
+    /* "dawg.pyx":669
  *                     break
  * 
  *             raw_value = &(raw_key[i])             # <<<<<<<<<<<<<<
@@ -12594,7 +12851,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
  */
     __pyx_cur_scope->__pyx_v_raw_value = (&(__pyx_cur_scope->__pyx_v_raw_key[__pyx_cur_scope->__pyx_v_i]));
 
-    /* "dawg.pyx":652
+    /* "dawg.pyx":670
  * 
  *             raw_value = &(raw_key[i])
  *             raw_value_len = completer.length() - i             # <<<<<<<<<<<<<<
@@ -12603,7 +12860,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
  */
     __pyx_cur_scope->__pyx_v_raw_value_len = (__pyx_cur_scope->__pyx_v_completer.length() - __pyx_cur_scope->__pyx_v_i);
 
-    /* "dawg.pyx":654
+    /* "dawg.pyx":672
  *             raw_value_len = completer.length() - i
  * 
  *             _b64_decoder.init()             # <<<<<<<<<<<<<<
@@ -12612,7 +12869,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
  */
     __pyx_cur_scope->__pyx_v__b64_decoder.init();
 
-    /* "dawg.pyx":655
+    /* "dawg.pyx":673
  * 
  *             _b64_decoder.init()
  *             _len = _b64_decoder.decode(raw_value, raw_value_len, _b64_decoder_storage)             # <<<<<<<<<<<<<<
@@ -12621,42 +12878,42 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
  */
     __pyx_cur_scope->__pyx_v__len = __pyx_cur_scope->__pyx_v__b64_decoder.decode(__pyx_cur_scope->__pyx_v_raw_value, __pyx_cur_scope->__pyx_v_raw_value_len, __pyx_cur_scope->__pyx_v__b64_decoder_storage);
 
-    /* "dawg.pyx":656
+    /* "dawg.pyx":674
  *             _b64_decoder.init()
  *             _len = _b64_decoder.decode(raw_value, raw_value_len, _b64_decoder_storage)
  *             value = _b64_decoder_storage[:_len]             # <<<<<<<<<<<<<<
  * 
  *             u_key = raw_key[:i].decode('utf8')
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-    __pyx_t_1 = __Pyx_PyBytes_FromStringAndSize(((const char*)__pyx_cur_scope->__pyx_v__b64_decoder_storage) + 0, __pyx_cur_scope->__pyx_v__len - 0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 656, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_PyBytes_FromStringAndSize(((const char*)__pyx_cur_scope->__pyx_v__b64_decoder_storage) + 0, __pyx_cur_scope->__pyx_v__len - 0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 674, __pyx_L1_error)
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     __Pyx_GIVEREF(__pyx_t_1);
     __pyx_t_1 = 0;
 
-    /* "dawg.pyx":658
+    /* "dawg.pyx":676
  *             value = _b64_decoder_storage[:_len]
  * 
  *             u_key = raw_key[:i].decode('utf8')             # <<<<<<<<<<<<<<
  *             yield (u_key, value)
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-    __pyx_t_1 = __Pyx_decode_c_string(__pyx_cur_scope->__pyx_v_raw_key, 0, __pyx_cur_scope->__pyx_v_i, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 658, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_decode_c_string(__pyx_cur_scope->__pyx_v_raw_key, 0, __pyx_cur_scope->__pyx_v_i, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 676, __pyx_L1_error)
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-    /* "dawg.pyx":659
+    /* "dawg.pyx":677
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  *             u_key = raw_key[:i].decode('utf8')
  *             yield (u_key, value)             # <<<<<<<<<<<<<<
  * 
  *     cpdef list keys(self, unicode prefix=""):
  */
-    __pyx_t_1 = PyTuple_New(2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 659, __pyx_L1_error)
+    __pyx_t_1 = PyTuple_New(2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 677, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
     __Pyx_INCREF(__pyx_cur_scope->__pyx_v_u_key);
     __Pyx_GIVEREF(__pyx_cur_scope->__pyx_v_u_key);
@@ -12673,11 +12930,11 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
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     __pyx_L10_resume_from_yield:;
-    if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 659, __pyx_L1_error)
+    if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 677, __pyx_L1_error)
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   CYTHON_MAYBE_UNUSED_VAR(__pyx_cur_scope);
 
-  /* "dawg.pyx":624
+  /* "dawg.pyx":642
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  *     def iteritems(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -12702,7 +12959,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_24generator2(__pyx_CoroutineObject *_
   return __pyx_r;
 }
 
-/* "dawg.pyx":661
+/* "dawg.pyx":679
  *             yield (u_key, value)
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  *     cpdef list keys(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -12748,7 +13005,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
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       PY_UINT64_T __pyx_type_dict_guard = __Pyx_get_tp_dict_version(((PyObject *)__pyx_v_self));
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-      __pyx_t_1 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_keys); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 661, __pyx_L1_error)
+      __pyx_t_1 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_keys); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 679, __pyx_L1_error)
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@@ -12765,10 +13022,10 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
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-        if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 661, __pyx_L1_error)
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-        if (!(likely(PyList_CheckExact(__pyx_t_2))||((__pyx_t_2) == Py_None)||(PyErr_Format(PyExc_TypeError, "Expected %.16s, got %.200s", "list", Py_TYPE(__pyx_t_2)->tp_name), 0))) __PYX_ERR(0, 661, __pyx_L1_error)
+        if (!(likely(PyList_CheckExact(__pyx_t_2))||((__pyx_t_2) == Py_None)||(PyErr_Format(PyExc_TypeError, "Expected %.16s, got %.200s", "list", Py_TYPE(__pyx_t_2)->tp_name), 0))) __PYX_ERR(0, 679, __pyx_L1_error)
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@@ -12787,7 +13044,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
     #endif
   }
 
-  /* "dawg.pyx":662
+  /* "dawg.pyx":680
  * 
  *     cpdef list keys(self, unicode prefix=""):
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@@ -12796,26 +13053,26 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
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     PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "encode");
-    __PYX_ERR(0, 662, __pyx_L1_error)
+    __PYX_ERR(0, 680, __pyx_L1_error)
   }
-  __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_v_prefix); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 662, __pyx_L1_error)
+  __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_v_prefix); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 680, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
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-  /* "dawg.pyx":664
+  /* "dawg.pyx":682
  *         cdef bytes b_prefix = prefix.encode('utf8')
  *         cdef int i
  *         cdef list res = []             # <<<<<<<<<<<<<<
  *         cdef char* raw_key
  * 
  */
-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 664, __pyx_L1_error)
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 682, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_res = ((PyObject*)__pyx_t_1);
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-  /* "dawg.pyx":667
+  /* "dawg.pyx":685
  *         cdef char* raw_key
  * 
  *         cdef BaseType index = self.dct.root()             # <<<<<<<<<<<<<<
@@ -12824,7 +13081,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
  */
   __pyx_v_index = __pyx_v_self->__pyx_base.__pyx_base.dct.root();
 
-  /* "dawg.pyx":668
+  /* "dawg.pyx":686
  * 
  *         cdef BaseType index = self.dct.root()
  *         if not self.dct.Follow(b_prefix, &index):             # <<<<<<<<<<<<<<
@@ -12833,13 +13090,13 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
  */
   if (unlikely(__pyx_v_b_prefix == Py_None)) {
     PyErr_SetString(PyExc_TypeError, "expected bytes, NoneType found");
-    __PYX_ERR(0, 668, __pyx_L1_error)
+    __PYX_ERR(0, 686, __pyx_L1_error)
   }
-  __pyx_t_5 = __Pyx_PyBytes_AsWritableString(__pyx_v_b_prefix); if (unlikely((!__pyx_t_5) && PyErr_Occurred())) __PYX_ERR(0, 668, __pyx_L1_error)
+  __pyx_t_5 = __Pyx_PyBytes_AsWritableString(__pyx_v_b_prefix); if (unlikely((!__pyx_t_5) && PyErr_Occurred())) __PYX_ERR(0, 686, __pyx_L1_error)
   __pyx_t_6 = ((!(__pyx_v_self->__pyx_base.__pyx_base.dct.Follow(__pyx_t_5, (&__pyx_v_index)) != 0)) != 0);
   if (__pyx_t_6) {
 
-    /* "dawg.pyx":669
+    /* "dawg.pyx":687
  *         cdef BaseType index = self.dct.root()
  *         if not self.dct.Follow(b_prefix, &index):
  *             return res             # <<<<<<<<<<<<<<
@@ -12851,7 +13108,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
     __pyx_r = __pyx_v_res;
     goto __pyx_L0;
 
-    /* "dawg.pyx":668
+    /* "dawg.pyx":686
  * 
  *         cdef BaseType index = self.dct.root()
  *         if not self.dct.Follow(b_prefix, &index):             # <<<<<<<<<<<<<<
@@ -12860,7 +13117,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
  */
   }
 
-  /* "dawg.pyx":672
+  /* "dawg.pyx":690
  * 
  *         cdef Completer completer
  *         init_completer(completer, self.dct, self.guide)             # <<<<<<<<<<<<<<
@@ -12869,7 +13126,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
  */
   __pyx_f_4dawg_init_completer(__pyx_v_completer, __pyx_v_self->__pyx_base.__pyx_base.dct, __pyx_v_self->__pyx_base.guide);
 
-  /* "dawg.pyx":673
+  /* "dawg.pyx":691
  *         cdef Completer completer
  *         init_completer(completer, self.dct, self.guide)
  *         completer.Start(index, b_prefix)             # <<<<<<<<<<<<<<
@@ -12878,12 +13135,12 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
  */
   if (unlikely(__pyx_v_b_prefix == Py_None)) {
     PyErr_SetString(PyExc_TypeError, "expected bytes, NoneType found");
-    __PYX_ERR(0, 673, __pyx_L1_error)
+    __PYX_ERR(0, 691, __pyx_L1_error)
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-  __pyx_t_7 = __Pyx_PyBytes_AsWritableString(__pyx_v_b_prefix); if (unlikely((!__pyx_t_7) && PyErr_Occurred())) __PYX_ERR(0, 673, __pyx_L1_error)
+  __pyx_t_7 = __Pyx_PyBytes_AsWritableString(__pyx_v_b_prefix); if (unlikely((!__pyx_t_7) && PyErr_Occurred())) __PYX_ERR(0, 691, __pyx_L1_error)
   __pyx_v_completer.Start(__pyx_v_index, __pyx_t_7);
 
-  /* "dawg.pyx":675
+  /* "dawg.pyx":693
  *         completer.Start(index, b_prefix)
  * 
  *         while completer.Next():             # <<<<<<<<<<<<<<
@@ -12894,7 +13151,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
     __pyx_t_6 = (__pyx_v_completer.Next() != 0);
     if (!__pyx_t_6) break;
 
-    /* "dawg.pyx":676
+    /* "dawg.pyx":694
  * 
  *         while completer.Next():
  *             raw_key = <char*>completer.key()             # <<<<<<<<<<<<<<
@@ -12903,7 +13160,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
  */
     __pyx_v_raw_key = ((char *)__pyx_v_completer.key());
 
-    /* "dawg.pyx":678
+    /* "dawg.pyx":696
  *             raw_key = <char*>completer.key()
  * 
  *             for i in range(0, completer.length()):             # <<<<<<<<<<<<<<
@@ -12915,7 +13172,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
     for (__pyx_t_10 = 0; __pyx_t_10 < __pyx_t_9; __pyx_t_10+=1) {
       __pyx_v_i = __pyx_t_10;
 
-      /* "dawg.pyx":679
+      /* "dawg.pyx":697
  * 
  *             for i in range(0, completer.length()):
  *                 if raw_key[i] == self._c_payload_separator:             # <<<<<<<<<<<<<<
@@ -12925,7 +13182,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
       __pyx_t_6 = (((__pyx_v_raw_key[__pyx_v_i]) == __pyx_v_self->_c_payload_separator) != 0);
       if (__pyx_t_6) {
 
-        /* "dawg.pyx":680
+        /* "dawg.pyx":698
  *             for i in range(0, completer.length()):
  *                 if raw_key[i] == self._c_payload_separator:
  *                     break             # <<<<<<<<<<<<<<
@@ -12934,7 +13191,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
  */
         goto __pyx_L7_break;
 
-        /* "dawg.pyx":679
+        /* "dawg.pyx":697
  * 
  *             for i in range(0, completer.length()):
  *                 if raw_key[i] == self._c_payload_separator:             # <<<<<<<<<<<<<<
@@ -12945,29 +13202,29 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
     }
     __pyx_L7_break:;
 
-    /* "dawg.pyx":682
+    /* "dawg.pyx":700
  *                     break
  * 
  *             u_key = raw_key[:i].decode('utf8')             # <<<<<<<<<<<<<<
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  *         return res
  */
-    __pyx_t_1 = __Pyx_decode_c_string(__pyx_v_raw_key, 0, __pyx_v_i, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 682, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_decode_c_string(__pyx_v_raw_key, 0, __pyx_v_i, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 700, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
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     __pyx_t_1 = 0;
 
-    /* "dawg.pyx":683
+    /* "dawg.pyx":701
  * 
  *             u_key = raw_key[:i].decode('utf8')
  *             res.append(u_key)             # <<<<<<<<<<<<<<
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-    __pyx_t_11 = __Pyx_PyList_Append(__pyx_v_res, __pyx_v_u_key); if (unlikely(__pyx_t_11 == ((int)-1))) __PYX_ERR(0, 683, __pyx_L1_error)
+    __pyx_t_11 = __Pyx_PyList_Append(__pyx_v_res, __pyx_v_u_key); if (unlikely(__pyx_t_11 == ((int)-1))) __PYX_ERR(0, 701, __pyx_L1_error)
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-  /* "dawg.pyx":684
+  /* "dawg.pyx":702
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  *             res.append(u_key)
  *         return res             # <<<<<<<<<<<<<<
@@ -12979,7 +13236,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG_keys(struct __pyx_obj_4dawg_BytesDAWG
   __pyx_r = __pyx_v_res;
   goto __pyx_L0;
 
-  /* "dawg.pyx":661
+  /* "dawg.pyx":679
  *             yield (u_key, value)
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  *     cpdef list keys(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -13034,7 +13291,7 @@ static PyObject *__pyx_pw_4dawg_9BytesDAWG_26keys(PyObject *__pyx_v_self, PyObje
         }
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       if (unlikely(kw_args > 0)) {
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+        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "keys") < 0)) __PYX_ERR(0, 679, __pyx_L3_error)
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@@ -13048,13 +13305,13 @@ static PyObject *__pyx_pw_4dawg_9BytesDAWG_26keys(PyObject *__pyx_v_self, PyObje
   }
   goto __pyx_L4_argument_unpacking_done;
   __pyx_L5_argtuple_error:;
-  __Pyx_RaiseArgtupleInvalid("keys", 0, 0, 1, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 661, __pyx_L3_error)
+  __Pyx_RaiseArgtupleInvalid("keys", 0, 0, 1, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 679, __pyx_L3_error)
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   __Pyx_RefNannyFinishContext();
   return NULL;
   __pyx_L4_argument_unpacking_done:;
-  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_prefix), (&PyUnicode_Type), 1, "prefix", 1))) __PYX_ERR(0, 661, __pyx_L1_error)
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_prefix), (&PyUnicode_Type), 1, "prefix", 1))) __PYX_ERR(0, 679, __pyx_L1_error)
   __pyx_r = __pyx_pf_4dawg_9BytesDAWG_25keys(((struct __pyx_obj_4dawg_BytesDAWG *)__pyx_v_self), __pyx_v_prefix);
 
   /* function exit code */
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   __pyx_t_2.__pyx_n = 1;
   __pyx_t_2.prefix = __pyx_v_prefix;
-  __pyx_t_1 = __pyx_vtabptr_4dawg_BytesDAWG->__pyx_base.keys(((struct __pyx_obj_4dawg_CompletionDAWG *)__pyx_v_self), 1, &__pyx_t_2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 661, __pyx_L1_error)
+  __pyx_t_1 = __pyx_vtabptr_4dawg_BytesDAWG->__pyx_base.keys(((struct __pyx_obj_4dawg_CompletionDAWG *)__pyx_v_self), 1, &__pyx_t_2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 679, __pyx_L1_error)
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@@ -13093,7 +13350,7 @@ static PyObject *__pyx_pf_4dawg_9BytesDAWG_25keys(struct __pyx_obj_4dawg_BytesDA
 }
 static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *__pyx_generator, CYTHON_UNUSED PyThreadState *__pyx_tstate, PyObject *__pyx_sent_value); /* proto */
 
-/* "dawg.pyx":686
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@@ -13131,7 +13388,7 @@ static PyObject *__pyx_pw_4dawg_9BytesDAWG_28iterkeys(PyObject *__pyx_v_self, Py
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-        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "iterkeys") < 0)) __PYX_ERR(0, 686, __pyx_L3_error)
+        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "iterkeys") < 0)) __PYX_ERR(0, 704, __pyx_L3_error)
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@@ -13145,13 +13402,13 @@ static PyObject *__pyx_pw_4dawg_9BytesDAWG_28iterkeys(PyObject *__pyx_v_self, Py
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   __pyx_L5_argtuple_error:;
-  __Pyx_RaiseArgtupleInvalid("iterkeys", 0, 0, 1, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 686, __pyx_L3_error)
+  __Pyx_RaiseArgtupleInvalid("iterkeys", 0, 0, 1, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 704, __pyx_L3_error)
   __pyx_L3_error:;
   __Pyx_AddTraceback("dawg.BytesDAWG.iterkeys", __pyx_clineno, __pyx_lineno, __pyx_filename);
   __Pyx_RefNannyFinishContext();
   return NULL;
   __pyx_L4_argument_unpacking_done:;
-  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_prefix), (&PyUnicode_Type), 1, "prefix", 1))) __PYX_ERR(0, 686, __pyx_L1_error)
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_prefix), (&PyUnicode_Type), 1, "prefix", 1))) __PYX_ERR(0, 704, __pyx_L1_error)
   __pyx_r = __pyx_pf_4dawg_9BytesDAWG_27iterkeys(((struct __pyx_obj_4dawg_BytesDAWG *)__pyx_v_self), __pyx_v_prefix);
 
   /* function exit code */
@@ -13172,7 +13429,7 @@ static PyObject *__pyx_pf_4dawg_9BytesDAWG_27iterkeys(struct __pyx_obj_4dawg_Byt
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     __pyx_cur_scope = ((struct __pyx_obj_4dawg___pyx_scope_struct_7_iterkeys *)Py_None);
     __Pyx_INCREF(Py_None);
-    __PYX_ERR(0, 686, __pyx_L1_error)
+    __PYX_ERR(0, 704, __pyx_L1_error)
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@@ -13183,7 +13440,7 @@ static PyObject *__pyx_pf_4dawg_9BytesDAWG_27iterkeys(struct __pyx_obj_4dawg_Byt
   __Pyx_INCREF(__pyx_cur_scope->__pyx_v_prefix);
   __Pyx_GIVEREF(__pyx_cur_scope->__pyx_v_prefix);
   {
-    __pyx_CoroutineObject *gen = __Pyx_Generator_New((__pyx_coroutine_body_t) __pyx_gb_4dawg_9BytesDAWG_29generator3, NULL, (PyObject *) __pyx_cur_scope, __pyx_n_s_iterkeys, __pyx_n_s_BytesDAWG_iterkeys, __pyx_n_s_dawg); if (unlikely(!gen)) __PYX_ERR(0, 686, __pyx_L1_error)
+    __pyx_CoroutineObject *gen = __Pyx_Generator_New((__pyx_coroutine_body_t) __pyx_gb_4dawg_9BytesDAWG_29generator3, NULL, (PyObject *) __pyx_cur_scope, __pyx_n_s_iterkeys, __pyx_n_s_BytesDAWG_iterkeys, __pyx_n_s_dawg); if (unlikely(!gen)) __PYX_ERR(0, 704, __pyx_L1_error)
     __Pyx_DECREF(__pyx_cur_scope);
     __Pyx_RefNannyFinishContext();
     return (PyObject *) gen;
@@ -13220,9 +13477,9 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
     return NULL;
   }
   __pyx_L3_first_run:;
-  if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 686, __pyx_L1_error)
+  if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 704, __pyx_L1_error)
 
-  /* "dawg.pyx":687
+  /* "dawg.pyx":705
  * 
  *     def iterkeys(self, unicode prefix=""):
  *         cdef bytes b_prefix = prefix.encode('utf8')             # <<<<<<<<<<<<<<
@@ -13231,15 +13488,15 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
  */
   if (unlikely(__pyx_cur_scope->__pyx_v_prefix == Py_None)) {
     PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "encode");
-    __PYX_ERR(0, 687, __pyx_L1_error)
+    __PYX_ERR(0, 705, __pyx_L1_error)
   }
-  __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_cur_scope->__pyx_v_prefix); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 687, __pyx_L1_error)
+  __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_cur_scope->__pyx_v_prefix); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 705, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __Pyx_GIVEREF(__pyx_t_1);
   __pyx_cur_scope->__pyx_v_b_prefix = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "dawg.pyx":691
+  /* "dawg.pyx":709
  *         cdef char* raw_key
  * 
  *         cdef BaseType index = self.dct.root()             # <<<<<<<<<<<<<<
@@ -13248,7 +13505,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
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   __pyx_cur_scope->__pyx_v_index = __pyx_cur_scope->__pyx_v_self->__pyx_base.__pyx_base.dct.root();
 
-  /* "dawg.pyx":692
+  /* "dawg.pyx":710
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  *         cdef BaseType index = self.dct.root()
  *         if not self.dct.Follow(b_prefix, &index):             # <<<<<<<<<<<<<<
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   if (unlikely(__pyx_cur_scope->__pyx_v_b_prefix == Py_None)) {
     PyErr_SetString(PyExc_TypeError, "expected bytes, NoneType found");
-    __PYX_ERR(0, 692, __pyx_L1_error)
+    __PYX_ERR(0, 710, __pyx_L1_error)
   }
-  __pyx_t_2 = __Pyx_PyBytes_AsWritableString(__pyx_cur_scope->__pyx_v_b_prefix); if (unlikely((!__pyx_t_2) && PyErr_Occurred())) __PYX_ERR(0, 692, __pyx_L1_error)
+  __pyx_t_2 = __Pyx_PyBytes_AsWritableString(__pyx_cur_scope->__pyx_v_b_prefix); if (unlikely((!__pyx_t_2) && PyErr_Occurred())) __PYX_ERR(0, 710, __pyx_L1_error)
   __pyx_t_3 = ((!(__pyx_cur_scope->__pyx_v_self->__pyx_base.__pyx_base.dct.Follow(__pyx_t_2, (&__pyx_cur_scope->__pyx_v_index)) != 0)) != 0);
   if (__pyx_t_3) {
 
-    /* "dawg.pyx":693
+    /* "dawg.pyx":711
  *         cdef BaseType index = self.dct.root()
  *         if not self.dct.Follow(b_prefix, &index):
  *             return             # <<<<<<<<<<<<<<
@@ -13274,7 +13531,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
     __pyx_r = NULL;
     goto __pyx_L0;
 
-    /* "dawg.pyx":692
+    /* "dawg.pyx":710
  * 
  *         cdef BaseType index = self.dct.root()
  *         if not self.dct.Follow(b_prefix, &index):             # <<<<<<<<<<<<<<
@@ -13283,7 +13540,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
  */
   }
 
-  /* "dawg.pyx":696
+  /* "dawg.pyx":714
  * 
  *         cdef Completer completer
  *         init_completer(completer, self.dct, self.guide)             # <<<<<<<<<<<<<<
@@ -13292,7 +13549,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
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   __pyx_f_4dawg_init_completer(__pyx_cur_scope->__pyx_v_completer, __pyx_cur_scope->__pyx_v_self->__pyx_base.__pyx_base.dct, __pyx_cur_scope->__pyx_v_self->__pyx_base.guide);
 
-  /* "dawg.pyx":697
+  /* "dawg.pyx":715
  *         cdef Completer completer
  *         init_completer(completer, self.dct, self.guide)
  *         completer.Start(index, b_prefix)             # <<<<<<<<<<<<<<
@@ -13301,12 +13558,12 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
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   if (unlikely(__pyx_cur_scope->__pyx_v_b_prefix == Py_None)) {
     PyErr_SetString(PyExc_TypeError, "expected bytes, NoneType found");
-    __PYX_ERR(0, 697, __pyx_L1_error)
+    __PYX_ERR(0, 715, __pyx_L1_error)
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-  __pyx_t_4 = __Pyx_PyBytes_AsWritableString(__pyx_cur_scope->__pyx_v_b_prefix); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 697, __pyx_L1_error)
+  __pyx_t_4 = __Pyx_PyBytes_AsWritableString(__pyx_cur_scope->__pyx_v_b_prefix); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 715, __pyx_L1_error)
   __pyx_cur_scope->__pyx_v_completer.Start(__pyx_cur_scope->__pyx_v_index, __pyx_t_4);
 
-  /* "dawg.pyx":699
+  /* "dawg.pyx":717
  *         completer.Start(index, b_prefix)
  * 
  *         while completer.Next():             # <<<<<<<<<<<<<<
@@ -13317,7 +13574,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
     __pyx_t_3 = (__pyx_cur_scope->__pyx_v_completer.Next() != 0);
     if (!__pyx_t_3) break;
 
-    /* "dawg.pyx":700
+    /* "dawg.pyx":718
  * 
  *         while completer.Next():
  *             raw_key = <char*>completer.key()             # <<<<<<<<<<<<<<
@@ -13326,7 +13583,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
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     __pyx_cur_scope->__pyx_v_raw_key = ((char *)__pyx_cur_scope->__pyx_v_completer.key());
 
-    /* "dawg.pyx":702
+    /* "dawg.pyx":720
  *             raw_key = <char*>completer.key()
  * 
  *             for i in range(0, completer.length()):             # <<<<<<<<<<<<<<
@@ -13338,7 +13595,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
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       __pyx_cur_scope->__pyx_v_i = __pyx_t_7;
 
-      /* "dawg.pyx":703
+      /* "dawg.pyx":721
  * 
  *             for i in range(0, completer.length()):
  *                 if raw_key[i] == self._c_payload_separator:             # <<<<<<<<<<<<<<
@@ -13348,7 +13605,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
       __pyx_t_3 = (((__pyx_cur_scope->__pyx_v_raw_key[__pyx_cur_scope->__pyx_v_i]) == __pyx_cur_scope->__pyx_v_self->_c_payload_separator) != 0);
       if (__pyx_t_3) {
 
-        /* "dawg.pyx":704
+        /* "dawg.pyx":722
  *             for i in range(0, completer.length()):
  *                 if raw_key[i] == self._c_payload_separator:
  *                     break             # <<<<<<<<<<<<<<
@@ -13357,7 +13614,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
  */
         goto __pyx_L8_break;
 
-        /* "dawg.pyx":703
+        /* "dawg.pyx":721
  * 
  *             for i in range(0, completer.length()):
  *                 if raw_key[i] == self._c_payload_separator:             # <<<<<<<<<<<<<<
@@ -13368,21 +13625,21 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
     }
     __pyx_L8_break:;
 
-    /* "dawg.pyx":706
+    /* "dawg.pyx":724
  *                     break
  * 
  *             u_key = raw_key[:i].decode('utf8')             # <<<<<<<<<<<<<<
  *             yield u_key
  * 
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-    __pyx_t_1 = __Pyx_decode_c_string(__pyx_cur_scope->__pyx_v_raw_key, 0, __pyx_cur_scope->__pyx_v_i, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 706, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_decode_c_string(__pyx_cur_scope->__pyx_v_raw_key, 0, __pyx_cur_scope->__pyx_v_i, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 724, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
     __Pyx_XGOTREF(__pyx_cur_scope->__pyx_v_u_key);
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     __Pyx_GIVEREF(__pyx_t_1);
     __pyx_t_1 = 0;
 
-    /* "dawg.pyx":707
+    /* "dawg.pyx":725
  * 
  *             u_key = raw_key[:i].decode('utf8')
  *             yield u_key             # <<<<<<<<<<<<<<
@@ -13398,11 +13655,11 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
     __pyx_generator->resume_label = 1;
     return __pyx_r;
     __pyx_L10_resume_from_yield:;
-    if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 707, __pyx_L1_error)
+    if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 725, __pyx_L1_error)
   }
   CYTHON_MAYBE_UNUSED_VAR(__pyx_cur_scope);
 
-  /* "dawg.pyx":686
+  /* "dawg.pyx":704
  *         return res
  * 
  *     def iterkeys(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -13427,7 +13684,7 @@ static PyObject *__pyx_gb_4dawg_9BytesDAWG_29generator3(__pyx_CoroutineObject *_
   return __pyx_r;
 }
 
-/* "dawg.pyx":709
+/* "dawg.pyx":727
  *             yield u_key
  * 
  *     cdef bint _has_value(self, BaseType index):             # <<<<<<<<<<<<<<
@@ -13441,7 +13698,7 @@ static int __pyx_f_4dawg_9BytesDAWG__has_value(struct __pyx_obj_4dawg_BytesDAWG
   __Pyx_RefNannyDeclarations
   __Pyx_RefNannySetupContext("_has_value", 0);
 
-  /* "dawg.pyx":710
+  /* "dawg.pyx":728
  * 
  *     cdef bint _has_value(self, BaseType index):
  *         cdef BaseType _index = index             # <<<<<<<<<<<<<<
@@ -13450,7 +13707,7 @@ static int __pyx_f_4dawg_9BytesDAWG__has_value(struct __pyx_obj_4dawg_BytesDAWG
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   __pyx_v__index = __pyx_v_index;
 
-  /* "dawg.pyx":711
+  /* "dawg.pyx":729
  *     cdef bint _has_value(self, BaseType index):
  *         cdef BaseType _index = index
  *         return self.dct.Follow(self._c_payload_separator, &_index)             # <<<<<<<<<<<<<<
@@ -13460,7 +13717,7 @@ static int __pyx_f_4dawg_9BytesDAWG__has_value(struct __pyx_obj_4dawg_BytesDAWG
   __pyx_r = __pyx_v_self->__pyx_base.__pyx_base.dct.Follow(__pyx_v_self->_c_payload_separator, (&__pyx_v__index));
   goto __pyx_L0;
 
-  /* "dawg.pyx":709
+  /* "dawg.pyx":727
  *             yield u_key
  * 
  *     cdef bint _has_value(self, BaseType index):             # <<<<<<<<<<<<<<
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 }
 
-/* "dawg.pyx":713
+/* "dawg.pyx":731
  *         return self.dct.Follow(self._c_payload_separator, &_index)
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  *     cdef list _similar_items(self, unicode current_prefix, unicode key, BaseType cur_index, dict replace_chars):             # <<<<<<<<<<<<<<
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-  /* "dawg.pyx":714
+  /* "dawg.pyx":732
  * 
  *     cdef list _similar_items(self, unicode current_prefix, unicode key, BaseType cur_index, dict replace_chars):
  *         cdef BaseType next_index, index = cur_index             # <<<<<<<<<<<<<<
@@ -13518,19 +13775,19 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG__similar_items(struct __pyx_obj_4dawg_
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   __pyx_v_index = __pyx_v_cur_index;
 
-  /* "dawg.pyx":717
+  /* "dawg.pyx":735
  *         cdef unicode prefix, u_replace_char, found_key
  *         cdef bytes b_step, b_replace_char
  *         cdef list res = []             # <<<<<<<<<<<<<<
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  * 
  */
-  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 717, __pyx_L1_error)
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 735, __pyx_L1_error)
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   __pyx_v_res = ((PyObject*)__pyx_t_1);
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-  /* "dawg.pyx":720
+  /* "dawg.pyx":738
  *         cdef list extra_items, value
  * 
  *         cdef int start_pos = len(current_prefix)             # <<<<<<<<<<<<<<
@@ -13539,12 +13796,12 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG__similar_items(struct __pyx_obj_4dawg_
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     PyErr_SetString(PyExc_TypeError, "object of type 'NoneType' has no len()");
-    __PYX_ERR(0, 720, __pyx_L1_error)
+    __PYX_ERR(0, 738, __pyx_L1_error)
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-  __pyx_t_2 = __Pyx_PyUnicode_GET_LENGTH(__pyx_v_current_prefix); if (unlikely(__pyx_t_2 == ((Py_ssize_t)-1))) __PYX_ERR(0, 720, __pyx_L1_error)
+  __pyx_t_2 = __Pyx_PyUnicode_GET_LENGTH(__pyx_v_current_prefix); if (unlikely(__pyx_t_2 == ((Py_ssize_t)-1))) __PYX_ERR(0, 738, __pyx_L1_error)
   __pyx_v_start_pos = __pyx_t_2;
 
-  /* "dawg.pyx":721
+  /* "dawg.pyx":739
  * 
  *         cdef int start_pos = len(current_prefix)
  *         cdef int end_pos = len(key)             # <<<<<<<<<<<<<<
@@ -13553,12 +13810,12 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG__similar_items(struct __pyx_obj_4dawg_
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   if (unlikely(__pyx_v_key == Py_None)) {
     PyErr_SetString(PyExc_TypeError, "object of type 'NoneType' has no len()");
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+    __PYX_ERR(0, 739, __pyx_L1_error)
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-  __pyx_t_2 = __Pyx_PyUnicode_GET_LENGTH(__pyx_v_key); if (unlikely(__pyx_t_2 == ((Py_ssize_t)-1))) __PYX_ERR(0, 721, __pyx_L1_error)
+  __pyx_t_2 = __Pyx_PyUnicode_GET_LENGTH(__pyx_v_key); if (unlikely(__pyx_t_2 == ((Py_ssize_t)-1))) __PYX_ERR(0, 739, __pyx_L1_error)
   __pyx_v_end_pos = __pyx_t_2;
 
-  /* "dawg.pyx":722
+  /* "dawg.pyx":740
  *         cdef int start_pos = len(current_prefix)
  *         cdef int end_pos = len(key)
  *         cdef int word_pos = start_pos             # <<<<<<<<<<<<<<
@@ -13567,7 +13824,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG__similar_items(struct __pyx_obj_4dawg_
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   __pyx_v_word_pos = __pyx_v_start_pos;
 
-  /* "dawg.pyx":724
+  /* "dawg.pyx":742
  *         cdef int word_pos = start_pos
  * 
  *         while word_pos < end_pos:             # <<<<<<<<<<<<<<
@@ -13578,17 +13835,17 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG__similar_items(struct __pyx_obj_4dawg_
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     if (!__pyx_t_3) break;
 
-    /* "dawg.pyx":725
+    /* "dawg.pyx":743
  * 
  *         while word_pos < end_pos:
  *             b_step = <bytes>(key[word_pos].encode('utf8'))             # <<<<<<<<<<<<<<
  * 
  *             if b_step in replace_chars:
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-    __pyx_t_4 = __Pyx_GetItemInt_Unicode(__pyx_v_key, __pyx_v_word_pos, int, 1, __Pyx_PyInt_From_int, 0, 1, 1); if (unlikely(__pyx_t_4 == (Py_UCS4)-1)) __PYX_ERR(0, 725, __pyx_L1_error)
-    __pyx_t_1 = PyUnicode_FromOrdinal(__pyx_t_4); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 725, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_GetItemInt_Unicode(__pyx_v_key, __pyx_v_word_pos, int, 1, __Pyx_PyInt_From_int, 0, 1, 1); if (unlikely(__pyx_t_4 == (Py_UCS4)-1)) __PYX_ERR(0, 743, __pyx_L1_error)
+    __pyx_t_1 = PyUnicode_FromOrdinal(__pyx_t_4); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 743, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
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+    __pyx_t_5 = PyUnicode_AsUTF8String(((PyObject*)__pyx_t_1)); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 743, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_5);
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@@ -13597,7 +13854,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG__similar_items(struct __pyx_obj_4dawg_
     __Pyx_XDECREF_SET(__pyx_v_b_step, ((PyObject*)__pyx_t_1));
     __pyx_t_1 = 0;
 
-    /* "dawg.pyx":727
+    /* "dawg.pyx":745
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  * 
  *             if b_step in replace_chars:             # <<<<<<<<<<<<<<
@@ -13606,13 +13863,13 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG__similar_items(struct __pyx_obj_4dawg_
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     if (unlikely(__pyx_v_replace_chars == Py_None)) {
       PyErr_SetString(PyExc_TypeError, "'NoneType' object is not iterable");
-      __PYX_ERR(0, 727, __pyx_L1_error)
+      __PYX_ERR(0, 745, __pyx_L1_error)
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-    __pyx_t_3 = (__Pyx_PyDict_ContainsTF(__pyx_v_b_step, __pyx_v_replace_chars, Py_EQ)); if (unlikely(__pyx_t_3 < 0)) __PYX_ERR(0, 727, __pyx_L1_error)
+    __pyx_t_3 = (__Pyx_PyDict_ContainsTF(__pyx_v_b_step, __pyx_v_replace_chars, Py_EQ)); if (unlikely(__pyx_t_3 < 0)) __PYX_ERR(0, 745, __pyx_L1_error)
     __pyx_t_6 = (__pyx_t_3 != 0);
     if (__pyx_t_6) {
 
-      /* "dawg.pyx":728
+      /* "dawg.pyx":746
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  *             if b_step in replace_chars:
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@@ -13621,7 +13878,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG__similar_items(struct __pyx_obj_4dawg_
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       __pyx_v_next_index = __pyx_v_index;
 
-      /* "dawg.pyx":729
+      /* "dawg.pyx":747
  *             if b_step in replace_chars:
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  *                 b_replace_char, u_replace_char = <tuple>replace_chars[b_step]             # <<<<<<<<<<<<<<
@@ -13630,9 +13887,9 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG__similar_items(struct __pyx_obj_4dawg_
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         PyErr_SetString(PyExc_TypeError, "'NoneType' object is not subscriptable");
-        __PYX_ERR(0, 729, __pyx_L1_error)
+        __PYX_ERR(0, 747, __pyx_L1_error)
       }
-      __pyx_t_1 = __Pyx_PyDict_GetItem(__pyx_v_replace_chars, __pyx_v_b_step); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 729, __pyx_L1_error)
+      __pyx_t_1 = __Pyx_PyDict_GetItem(__pyx_v_replace_chars, __pyx_v_b_step); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 747, __pyx_L1_error)
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       __Pyx_INCREF(__pyx_t_5);
@@ -13643,7 +13900,7 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG__similar_items(struct __pyx_obj_4dawg_
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           else if (size >= 0) __Pyx_RaiseNeedMoreValuesError(size);
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+          __PYX_ERR(0, 747, __pyx_L1_error)
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@@ -13651,23 +13908,23 @@ static PyObject *__pyx_f_4dawg_9BytesDAWG__similar_items(struct __pyx_obj_4dawg_
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-        __pyx_t_1 = PySequence_ITEM(sequence, 0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 729, __pyx_L1_error)
+        __pyx_t_1 = PySequence_ITEM(sequence, 0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 747, __pyx_L1_error)
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-        __pyx_t_7 = PySequence_ITEM(sequence, 1); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 729, __pyx_L1_error)
+        __pyx_t_7 = PySequence_ITEM(sequence, 1); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 747, __pyx_L1_error)
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-        __Pyx_RaiseNoneNotIterableError(); __PYX_ERR(0, 729, __pyx_L1_error)
+        __Pyx_RaiseNoneNotIterableError(); __PYX_ERR(0, 747, __pyx_L1_error)
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-  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_prefix), (&PyUnicode_Type), 1, "prefix", 1))) __PYX_ERR(0, 951, __pyx_L1_error)
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_prefix), (&PyUnicode_Type), 1, "prefix", 1))) __PYX_ERR(0, 1010, __pyx_L1_error)
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+  __pyx_t_1 = __pyx_vtabptr_4dawg_IntCompletionDAWG->items(__pyx_v_self, 1, &__pyx_t_2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 1010, __pyx_L1_error)
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-/* "dawg.pyx":971
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-  __Pyx_RaiseArgtupleInvalid("iteritems", 0, 0, 1, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 971, __pyx_L3_error)
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-  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_prefix), (&PyUnicode_Type), 1, "prefix", 1))) __PYX_ERR(0, 971, __pyx_L1_error)
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@@ -18640,7 +19415,7 @@ static PyObject *__pyx_pf_4dawg_17IntCompletionDAWG_12iteritems(struct __pyx_obj
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-    __pyx_CoroutineObject *gen = __Pyx_Generator_New((__pyx_coroutine_body_t) __pyx_gb_4dawg_17IntCompletionDAWG_14generator5, NULL, (PyObject *) __pyx_cur_scope, __pyx_n_s_iteritems, __pyx_n_s_IntCompletionDAWG_iteritems, __pyx_n_s_dawg); if (unlikely(!gen)) __PYX_ERR(0, 971, __pyx_L1_error)
+    __pyx_CoroutineObject *gen = __Pyx_Generator_New((__pyx_coroutine_body_t) __pyx_gb_4dawg_17IntCompletionDAWG_14generator5, NULL, (PyObject *) __pyx_cur_scope, __pyx_n_s_iteritems, __pyx_n_s_IntCompletionDAWG_iteritems, __pyx_n_s_dawg); if (unlikely(!gen)) __PYX_ERR(0, 1030, __pyx_L1_error)
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     return NULL;
   }
   __pyx_L3_first_run:;
-  if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 971, __pyx_L1_error)
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+  __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_cur_scope->__pyx_v_prefix); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 1031, __pyx_L1_error)
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-  /* "dawg.pyx":973
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@@ -18703,7 +19478,7 @@ static PyObject *__pyx_gb_4dawg_17IntCompletionDAWG_14generator5(__pyx_Coroutine
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+  __pyx_t_2 = __Pyx_PyBytes_AsWritableString(__pyx_cur_scope->__pyx_v_b_prefix); if (unlikely((!__pyx_t_2) && PyErr_Occurred())) __PYX_ERR(0, 1035, __pyx_L1_error)
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-    /* "dawg.pyx":977
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@@ -18729,7 +19504,7 @@ static PyObject *__pyx_gb_4dawg_17IntCompletionDAWG_14generator5(__pyx_Coroutine
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-    /* "dawg.pyx":976
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  *         if not self.dct.Follow(b_prefix, &index):             # <<<<<<<<<<<<<<
@@ -18738,7 +19513,7 @@ static PyObject *__pyx_gb_4dawg_17IntCompletionDAWG_14generator5(__pyx_Coroutine
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   }
 
-  /* "dawg.pyx":980
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@@ -18747,7 +19522,7 @@ static PyObject *__pyx_gb_4dawg_17IntCompletionDAWG_14generator5(__pyx_Coroutine
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-  /* "dawg.pyx":981
+  /* "dawg.pyx":1040
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  *         completer.Start(index, b_prefix)             # <<<<<<<<<<<<<<
@@ -18756,12 +19531,12 @@ static PyObject *__pyx_gb_4dawg_17IntCompletionDAWG_14generator5(__pyx_Coroutine
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+    __PYX_ERR(0, 1040, __pyx_L1_error)
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+  __pyx_t_4 = __Pyx_PyBytes_AsWritableString(__pyx_cur_scope->__pyx_v_b_prefix); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 1040, __pyx_L1_error)
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-  /* "dawg.pyx":983
+  /* "dawg.pyx":1042
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  *         while completer.Next():             # <<<<<<<<<<<<<<
@@ -18772,7 +19547,7 @@ static PyObject *__pyx_gb_4dawg_17IntCompletionDAWG_14generator5(__pyx_Coroutine
     __pyx_t_3 = (__pyx_cur_scope->__pyx_v_completer.Next() != 0);
     if (!__pyx_t_3) break;
 
-    /* "dawg.pyx":984
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@@ -18780,7 +19555,7 @@ static PyObject *__pyx_gb_4dawg_17IntCompletionDAWG_14generator5(__pyx_Coroutine
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-    __pyx_t_1 = __Pyx_decode_c_string(__pyx_t_4, 0, strlen(__pyx_t_4), NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 984, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_decode_c_string(__pyx_t_4, 0, strlen(__pyx_t_4), NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 1043, __pyx_L1_error)
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@@ -18788,7 +19563,7 @@ static PyObject *__pyx_gb_4dawg_17IntCompletionDAWG_14generator5(__pyx_Coroutine
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-    /* "dawg.pyx":985
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@@ -18796,14 +19571,14 @@ static PyObject *__pyx_gb_4dawg_17IntCompletionDAWG_14generator5(__pyx_Coroutine
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     __pyx_cur_scope->__pyx_v_value = __pyx_cur_scope->__pyx_v_completer.value();
 
-    /* "dawg.pyx":986
+    /* "dawg.pyx":1045
  *             key = (<char*>completer.key()).decode('utf8')
  *             value = completer.value()
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-    __pyx_t_1 = __Pyx_PyInt_From_int(__pyx_cur_scope->__pyx_v_value); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 986, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_PyInt_From_int(__pyx_cur_scope->__pyx_v_value); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 1045, __pyx_L1_error)
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-    __pyx_t_5 = PyTuple_New(2); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 986, __pyx_L1_error)
+    __pyx_t_5 = PyTuple_New(2); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 1045, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_5);
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     __Pyx_GIVEREF(__pyx_cur_scope->__pyx_v_key);
@@ -18820,11 +19595,11 @@ static PyObject *__pyx_gb_4dawg_17IntCompletionDAWG_14generator5(__pyx_Coroutine
     __pyx_generator->resume_label = 1;
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     __pyx_L7_resume_from_yield:;
-    if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 986, __pyx_L1_error)
+    if (unlikely(!__pyx_sent_value)) __PYX_ERR(0, 1045, __pyx_L1_error)
   }
   CYTHON_MAYBE_UNUSED_VAR(__pyx_cur_scope);
 
-  /* "dawg.pyx":971
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  *         return res
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  *     def iteritems(self, unicode prefix=""):             # <<<<<<<<<<<<<<
@@ -19263,8 +20038,9 @@ static PyMethodDef __pyx_methods_4dawg_DAWG[] = {
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   {"prefixes", (PyCFunction)__pyx_pw_4dawg_4DAWG_37prefixes, METH_O, __pyx_doc_4dawg_4DAWG_36prefixes},
   {"b_prefixes", (PyCFunction)__pyx_pw_4dawg_4DAWG_39b_prefixes, METH_O, __pyx_doc_4dawg_4DAWG_38b_prefixes},
-  {"iterprefixes", (PyCFunction)__pyx_pw_4dawg_4DAWG_41iterprefixes, METH_O, __pyx_doc_4dawg_4DAWG_40iterprefixes},
-  {"compile_replaces", (PyCFunction)__pyx_pw_4dawg_4DAWG_44compile_replaces, METH_O, __pyx_doc_4dawg_4DAWG_43compile_replaces},
+  {"longest_prefix", (PyCFunction)__pyx_pw_4dawg_4DAWG_41longest_prefix, METH_O, __pyx_doc_4dawg_4DAWG_40longest_prefix},
+  {"iterprefixes", (PyCFunction)__pyx_pw_4dawg_4DAWG_43iterprefixes, METH_O, __pyx_doc_4dawg_4DAWG_42iterprefixes},
+  {"compile_replaces", (PyCFunction)__pyx_pw_4dawg_4DAWG_46compile_replaces, METH_O, __pyx_doc_4dawg_4DAWG_45compile_replaces},
   {0, 0, 0, 0}
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@@ -19511,6 +20287,7 @@ static PyMethodDef __pyx_methods_4dawg_BytesDAWG[] = {
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   {"similar_items", (PyCFunction)(void*)(PyCFunctionWithKeywords)__pyx_pw_4dawg_9BytesDAWG_31similar_items, METH_VARARGS|METH_KEYWORDS, __pyx_doc_4dawg_9BytesDAWG_30similar_items},
   {"similar_item_values", (PyCFunction)(void*)(PyCFunctionWithKeywords)__pyx_pw_4dawg_9BytesDAWG_33similar_item_values, METH_VARARGS|METH_KEYWORDS, __pyx_doc_4dawg_9BytesDAWG_32similar_item_values},
+  {"longest_prefix", (PyCFunction)__pyx_pw_4dawg_9BytesDAWG_35longest_prefix, METH_O, __pyx_doc_4dawg_9BytesDAWG_34longest_prefix},
   {0, 0, 0, 0}
 };
 
@@ -19749,6 +20526,7 @@ static PyMethodDef __pyx_methods_4dawg_IntDAWG[] = {
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   {"get_value", (PyCFunction)__pyx_pw_4dawg_7IntDAWG_7get_value, METH_O, __pyx_doc_4dawg_7IntDAWG_6get_value},
   {"b_get_value", (PyCFunction)__pyx_pw_4dawg_7IntDAWG_9b_get_value, METH_O, __pyx_doc_4dawg_7IntDAWG_8b_get_value},
+  {"longest_prefix", (PyCFunction)__pyx_pw_4dawg_7IntDAWG_11longest_prefix, METH_O, __pyx_doc_4dawg_7IntDAWG_10longest_prefix},
   {0, 0, 0, 0}
 };
 
@@ -21657,14 +22435,15 @@ static __Pyx_StringTabEntry __pyx_string_tab[] = {
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   {&__pyx_kp_u_Negative_values_are_not_supporte, __pyx_k_Negative_values_are_not_supporte, sizeof(__pyx_k_Negative_values_are_not_supporte), 0, 1, 0, 0},
+  {&__pyx_kp_u_No_prefix_found, __pyx_k_No_prefix_found, sizeof(__pyx_k_No_prefix_found), 0, 1, 0, 0},
   {&__pyx_kp_u_None, __pyx_k_None, sizeof(__pyx_k_None), 0, 1, 0, 0},
   {&__pyx_kp_u_Payload_separator, __pyx_k_Payload_separator, sizeof(__pyx_k_Payload_separator), 0, 1, 0, 0},
   {&__pyx_n_s_RecordDAWG, __pyx_k_RecordDAWG, sizeof(__pyx_k_RecordDAWG), 0, 0, 1, 1},
   {&__pyx_n_s_RecordDAWG_iteritems, __pyx_k_RecordDAWG_iteritems, sizeof(__pyx_k_RecordDAWG_iteritems), 0, 0, 1, 1},
   {&__pyx_n_s_Struct, __pyx_k_Struct, sizeof(__pyx_k_Struct), 0, 0, 1, 1},
   {&__pyx_n_s_ValueError, __pyx_k_ValueError, sizeof(__pyx_k_ValueError), 0, 0, 1, 1},
-  {&__pyx_kp_u__11, __pyx_k__11, sizeof(__pyx_k__11), 0, 1, 0, 0},
-  {&__pyx_kp_b__13, __pyx_k__13, sizeof(__pyx_k__13), 0, 0, 0, 0},
+  {&__pyx_kp_u__12, __pyx_k__12, sizeof(__pyx_k__12), 0, 1, 0, 0},
+  {&__pyx_kp_b__14, __pyx_k__14, sizeof(__pyx_k__14), 0, 0, 0, 0},
   {&__pyx_kp_u__2, __pyx_k__2, sizeof(__pyx_k__2), 0, 1, 0, 0},
   {&__pyx_kp_u__6, __pyx_k__6, sizeof(__pyx_k__6), 0, 1, 0, 0},
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@@ -21752,9 +22531,9 @@ static CYTHON_SMALL_CODE int __Pyx_InitCachedBuiltins(void) {
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   __pyx_builtin_open = __Pyx_GetBuiltinName(__pyx_n_s_open); if (!__pyx_builtin_open) __PYX_ERR(0, 164, __pyx_L1_error)
-  __pyx_builtin_super = __Pyx_GetBuiltinName(__pyx_n_s_super); if (!__pyx_builtin_super) __PYX_ERR(0, 300, __pyx_L1_error)
-  __pyx_builtin_range = __Pyx_GetBuiltinName(__pyx_n_s_range); if (!__pyx_builtin_range) __PYX_ERR(0, 431, __pyx_L1_error)
-  __pyx_builtin_KeyError = __Pyx_GetBuiltinName(__pyx_n_s_KeyError); if (!__pyx_builtin_KeyError) __PYX_ERR(0, 523, __pyx_L1_error)
+  __pyx_builtin_KeyError = __Pyx_GetBuiltinName(__pyx_n_s_KeyError); if (!__pyx_builtin_KeyError) __PYX_ERR(0, 272, __pyx_L1_error)
+  __pyx_builtin_super = __Pyx_GetBuiltinName(__pyx_n_s_super); if (!__pyx_builtin_super) __PYX_ERR(0, 318, __pyx_L1_error)
+  __pyx_builtin_range = __Pyx_GetBuiltinName(__pyx_n_s_range); if (!__pyx_builtin_range) __PYX_ERR(0, 449, __pyx_L1_error)
   return 0;
   __pyx_L1_error:;
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@@ -21808,50 +22587,61 @@ static CYTHON_SMALL_CODE int __Pyx_InitCachedConstants(void) {
   __Pyx_GOTREF(__pyx_tuple__5);
   __Pyx_GIVEREF(__pyx_tuple__5);
 
-  /* "dawg.pyx":277
+  /* "dawg.pyx":272
+ *             return key[:lastpos]
+ *         else:
+ *             raise KeyError("No prefix found")             # <<<<<<<<<<<<<<
+ * 
+ *     def iterprefixes(self, unicode key):
+ */
+  __pyx_tuple__7 = PyTuple_Pack(1, __pyx_kp_u_No_prefix_found); if (unlikely(!__pyx_tuple__7)) __PYX_ERR(0, 272, __pyx_L1_error)
+  __Pyx_GOTREF(__pyx_tuple__7);
+  __Pyx_GIVEREF(__pyx_tuple__7);
+
+  /* "dawg.pyx":295
  *         for k,v in replaces.items():
  *             if len(k) != 1 or len(v) != 1:
  *                 raise ValueError("Keys and values must be single-char unicode strings.")             # <<<<<<<<<<<<<<
  * 
  *         return dict(
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-  __pyx_tuple__7 = PyTuple_Pack(1, __pyx_kp_u_Keys_and_values_must_be_single_c); if (unlikely(!__pyx_tuple__7)) __PYX_ERR(0, 277, __pyx_L1_error)
-  __Pyx_GOTREF(__pyx_tuple__7);
-  __Pyx_GIVEREF(__pyx_tuple__7);
+  __pyx_tuple__8 = PyTuple_Pack(1, __pyx_kp_u_Keys_and_values_must_be_single_c); if (unlikely(!__pyx_tuple__8)) __PYX_ERR(0, 295, __pyx_L1_error)
+  __Pyx_GOTREF(__pyx_tuple__8);
+  __Pyx_GIVEREF(__pyx_tuple__8);
 
-  /* "dawg.pyx":378
+  /* "dawg.pyx":396
  *         if not res:
  *             self.dct.Clear()
  *             raise IOError("Invalid data format: can't load _dawg.Dictionary")             # <<<<<<<<<<<<<<
  * 
  *         res = self.guide.Read(<istream*> &stream)
  */
-  __pyx_tuple__8 = PyTuple_Pack(1, __pyx_kp_u_Invalid_data_format_can_t_load); if (unlikely(!__pyx_tuple__8)) __PYX_ERR(0, 378, __pyx_L1_error)
-  __Pyx_GOTREF(__pyx_tuple__8);
-  __Pyx_GIVEREF(__pyx_tuple__8);
+  __pyx_tuple__9 = PyTuple_Pack(1, __pyx_kp_u_Invalid_data_format_can_t_load); if (unlikely(!__pyx_tuple__9)) __PYX_ERR(0, 396, __pyx_L1_error)
+  __Pyx_GOTREF(__pyx_tuple__9);
+  __Pyx_GIVEREF(__pyx_tuple__9);
 
-  /* "dawg.pyx":384
+  /* "dawg.pyx":402
  *             self.guide.Clear()
  *             self.dct.Clear()
  *             raise IOError("Invalid data format: can't load _dawg.Guide")             # <<<<<<<<<<<<<<
  * 
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-  __pyx_tuple__9 = PyTuple_Pack(1, __pyx_kp_u_Invalid_data_format_can_t_load_2); if (unlikely(!__pyx_tuple__9)) __PYX_ERR(0, 384, __pyx_L1_error)
-  __Pyx_GOTREF(__pyx_tuple__9);
-  __Pyx_GIVEREF(__pyx_tuple__9);
+  __pyx_tuple__10 = PyTuple_Pack(1, __pyx_kp_u_Invalid_data_format_can_t_load_2); if (unlikely(!__pyx_tuple__10)) __PYX_ERR(0, 402, __pyx_L1_error)
+  __Pyx_GOTREF(__pyx_tuple__10);
+  __Pyx_GIVEREF(__pyx_tuple__10);
 
-  /* "dawg.pyx":855
+  /* "dawg.pyx":894
  * 
  * 
  * def _iterable_from_argument(arg):             # <<<<<<<<<<<<<<
  *     if arg is None:
  *         arg = []
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-  __pyx_tuple__14 = PyTuple_Pack(3, __pyx_n_s_arg, __pyx_n_s_genexpr, __pyx_n_s_genexpr); if (unlikely(!__pyx_tuple__14)) __PYX_ERR(0, 855, __pyx_L1_error)
-  __Pyx_GOTREF(__pyx_tuple__14);
-  __Pyx_GIVEREF(__pyx_tuple__14);
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+  __pyx_tuple__15 = PyTuple_Pack(3, __pyx_n_s_arg, __pyx_n_s_genexpr, __pyx_n_s_genexpr); if (unlikely(!__pyx_tuple__15)) __PYX_ERR(0, 894, __pyx_L1_error)
+  __Pyx_GOTREF(__pyx_tuple__15);
+  __Pyx_GIVEREF(__pyx_tuple__15);
+  __pyx_codeobj__16 = (PyObject*)__Pyx_PyCode_New(1, 0, 3, 0, CO_OPTIMIZED|CO_NEWLOCALS, __pyx_empty_bytes, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_tuple__15, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_kp_s_src_dawg_pyx, __pyx_n_s_iterable_from_argument, 894, __pyx_empty_bytes); if (unlikely(!__pyx_codeobj__16)) __PYX_ERR(0, 894, __pyx_L1_error)
   __Pyx_RefNannyFinishContext();
   return 0;
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@@ -21930,15 +22720,15 @@ static int __Pyx_modinit_type_init_code(void) {
   __pyx_vtable_4dawg_CompletionDAWG.__pyx_base.frombytes = (PyObject *(*)(struct __pyx_obj_4dawg_DAWG *, PyObject *, int __pyx_skip_dispatch))__pyx_f_4dawg_14CompletionDAWG_frombytes;
   __pyx_vtable_4dawg_CompletionDAWG.keys = (PyObject *(*)(struct __pyx_obj_4dawg_CompletionDAWG *, int __pyx_skip_dispatch, struct __pyx_opt_args_4dawg_14CompletionDAWG_keys *__pyx_optional_args))__pyx_f_4dawg_14CompletionDAWG_keys;
   __pyx_type_4dawg_CompletionDAWG.tp_base = __pyx_ptype_4dawg_DAWG;
-  if (PyType_Ready(&__pyx_type_4dawg_CompletionDAWG) < 0) __PYX_ERR(0, 293, __pyx_L1_error)
+  if (PyType_Ready(&__pyx_type_4dawg_CompletionDAWG) < 0) __PYX_ERR(0, 311, __pyx_L1_error)
   #if PY_VERSION_HEX < 0x030800B1
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   #endif
   if ((CYTHON_USE_TYPE_SLOTS && CYTHON_USE_PYTYPE_LOOKUP) && likely(!__pyx_type_4dawg_CompletionDAWG.tp_dictoffset && __pyx_type_4dawg_CompletionDAWG.tp_getattro == PyObject_GenericGetAttr)) {
     __pyx_type_4dawg_CompletionDAWG.tp_getattro = __Pyx_PyObject_GenericGetAttr;
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-  if (__Pyx_SetVtable(__pyx_type_4dawg_CompletionDAWG.tp_dict, __pyx_vtabptr_4dawg_CompletionDAWG) < 0) __PYX_ERR(0, 293, __pyx_L1_error)
-  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_CompletionDAWG, (PyObject *)&__pyx_type_4dawg_CompletionDAWG) < 0) __PYX_ERR(0, 293, __pyx_L1_error)
+  if (__Pyx_SetVtable(__pyx_type_4dawg_CompletionDAWG.tp_dict, __pyx_vtabptr_4dawg_CompletionDAWG) < 0) __PYX_ERR(0, 311, __pyx_L1_error)
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_CompletionDAWG, (PyObject *)&__pyx_type_4dawg_CompletionDAWG) < 0) __PYX_ERR(0, 311, __pyx_L1_error)
   __pyx_ptype_4dawg_CompletionDAWG = &__pyx_type_4dawg_CompletionDAWG;
   __pyx_vtabptr_4dawg_BytesDAWG = &__pyx_vtable_4dawg_BytesDAWG;
   __pyx_vtable_4dawg_BytesDAWG.__pyx_base = *__pyx_vtabptr_4dawg_CompletionDAWG;
@@ -21959,7 +22749,7 @@ static int __Pyx_modinit_type_init_code(void) {
   __pyx_vtable_4dawg_BytesDAWG._similar_item_values = (PyObject *(*)(struct __pyx_obj_4dawg_BytesDAWG *, int, PyObject *, dawgdic::BaseType, PyObject *))__pyx_f_4dawg_9BytesDAWG__similar_item_values;
   __pyx_vtable_4dawg_BytesDAWG.similar_item_values = (PyObject *(*)(struct __pyx_obj_4dawg_BytesDAWG *, PyObject *, PyObject *, int __pyx_skip_dispatch))__pyx_f_4dawg_9BytesDAWG_similar_item_values;
   __pyx_type_4dawg_BytesDAWG.tp_base = __pyx_ptype_4dawg_CompletionDAWG;
-  if (PyType_Ready(&__pyx_type_4dawg_BytesDAWG) < 0) __PYX_ERR(0, 460, __pyx_L1_error)
+  if (PyType_Ready(&__pyx_type_4dawg_BytesDAWG) < 0) __PYX_ERR(0, 478, __pyx_L1_error)
   #if PY_VERSION_HEX < 0x030800B1
   __pyx_type_4dawg_BytesDAWG.tp_print = 0;
   #endif
@@ -21968,7 +22758,7 @@ static int __Pyx_modinit_type_init_code(void) {
   }
   #if CYTHON_COMPILING_IN_CPYTHON
   {
-    PyObject *wrapper = PyObject_GetAttrString((PyObject *)&__pyx_type_4dawg_BytesDAWG, "__init__"); if (unlikely(!wrapper)) __PYX_ERR(0, 460, __pyx_L1_error)
+    PyObject *wrapper = PyObject_GetAttrString((PyObject *)&__pyx_type_4dawg_BytesDAWG, "__init__"); if (unlikely(!wrapper)) __PYX_ERR(0, 478, __pyx_L1_error)
     if (Py_TYPE(wrapper) == &PyWrapperDescr_Type) {
       __pyx_wrapperbase_4dawg_9BytesDAWG___init__ = *((PyWrapperDescrObject *)wrapper)->d_base;
       __pyx_wrapperbase_4dawg_9BytesDAWG___init__.doc = __pyx_doc_4dawg_9BytesDAWG___init__;
@@ -21976,15 +22766,15 @@ static int __Pyx_modinit_type_init_code(void) {
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   }
   #endif
-  if (__Pyx_SetVtable(__pyx_type_4dawg_BytesDAWG.tp_dict, __pyx_vtabptr_4dawg_BytesDAWG) < 0) __PYX_ERR(0, 460, __pyx_L1_error)
-  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_BytesDAWG, (PyObject *)&__pyx_type_4dawg_BytesDAWG) < 0) __PYX_ERR(0, 460, __pyx_L1_error)
+  if (__Pyx_SetVtable(__pyx_type_4dawg_BytesDAWG.tp_dict, __pyx_vtabptr_4dawg_BytesDAWG) < 0) __PYX_ERR(0, 478, __pyx_L1_error)
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_BytesDAWG, (PyObject *)&__pyx_type_4dawg_BytesDAWG) < 0) __PYX_ERR(0, 478, __pyx_L1_error)
   __pyx_ptype_4dawg_BytesDAWG = &__pyx_type_4dawg_BytesDAWG;
   __pyx_vtabptr_4dawg_RecordDAWG = &__pyx_vtable_4dawg_RecordDAWG;
   __pyx_vtable_4dawg_RecordDAWG.__pyx_base = *__pyx_vtabptr_4dawg_BytesDAWG;
   __pyx_vtable_4dawg_RecordDAWG.__pyx_base._value_for_index = (PyObject *(*)(struct __pyx_obj_4dawg_BytesDAWG *, dawgdic::BaseType))__pyx_f_4dawg_10RecordDAWG__value_for_index;
   __pyx_vtable_4dawg_RecordDAWG.__pyx_base.items = (PyObject *(*)(struct __pyx_obj_4dawg_BytesDAWG *, int __pyx_skip_dispatch, struct __pyx_opt_args_4dawg_9BytesDAWG_items *__pyx_optional_args))__pyx_f_4dawg_10RecordDAWG_items;
   __pyx_type_4dawg_RecordDAWG.tp_base = __pyx_ptype_4dawg_BytesDAWG;
-  if (PyType_Ready(&__pyx_type_4dawg_RecordDAWG) < 0) __PYX_ERR(0, 807, __pyx_L1_error)
+  if (PyType_Ready(&__pyx_type_4dawg_RecordDAWG) < 0) __PYX_ERR(0, 846, __pyx_L1_error)
   #if PY_VERSION_HEX < 0x030800B1
   __pyx_type_4dawg_RecordDAWG.tp_print = 0;
   #endif
@@ -21993,7 +22783,7 @@ static int __Pyx_modinit_type_init_code(void) {
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   #if CYTHON_COMPILING_IN_CPYTHON
   {
-    PyObject *wrapper = PyObject_GetAttrString((PyObject *)&__pyx_type_4dawg_RecordDAWG, "__init__"); if (unlikely(!wrapper)) __PYX_ERR(0, 807, __pyx_L1_error)
+    PyObject *wrapper = PyObject_GetAttrString((PyObject *)&__pyx_type_4dawg_RecordDAWG, "__init__"); if (unlikely(!wrapper)) __PYX_ERR(0, 846, __pyx_L1_error)
     if (Py_TYPE(wrapper) == &PyWrapperDescr_Type) {
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       __pyx_wrapperbase_4dawg_10RecordDAWG___init__.doc = __pyx_doc_4dawg_10RecordDAWG___init__;
@@ -22001,8 +22791,8 @@ static int __Pyx_modinit_type_init_code(void) {
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   }
   #endif
-  if (__Pyx_SetVtable(__pyx_type_4dawg_RecordDAWG.tp_dict, __pyx_vtabptr_4dawg_RecordDAWG) < 0) __PYX_ERR(0, 807, __pyx_L1_error)
-  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_RecordDAWG, (PyObject *)&__pyx_type_4dawg_RecordDAWG) < 0) __PYX_ERR(0, 807, __pyx_L1_error)
+  if (__Pyx_SetVtable(__pyx_type_4dawg_RecordDAWG.tp_dict, __pyx_vtabptr_4dawg_RecordDAWG) < 0) __PYX_ERR(0, 846, __pyx_L1_error)
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_RecordDAWG, (PyObject *)&__pyx_type_4dawg_RecordDAWG) < 0) __PYX_ERR(0, 846, __pyx_L1_error)
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   __pyx_vtabptr_4dawg_IntDAWG = &__pyx_vtable_4dawg_IntDAWG;
   __pyx_vtable_4dawg_IntDAWG.__pyx_base = *__pyx_vtabptr_4dawg_DAWG;
@@ -22010,7 +22800,7 @@ static int __Pyx_modinit_type_init_code(void) {
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   __pyx_vtable_4dawg_IntDAWG.b_get_value = (int (*)(struct __pyx_obj_4dawg_IntDAWG *, PyObject *, int __pyx_skip_dispatch))__pyx_f_4dawg_7IntDAWG_b_get_value;
   __pyx_type_4dawg_IntDAWG.tp_base = __pyx_ptype_4dawg_DAWG;
-  if (PyType_Ready(&__pyx_type_4dawg_IntDAWG) < 0) __PYX_ERR(0, 866, __pyx_L1_error)
+  if (PyType_Ready(&__pyx_type_4dawg_IntDAWG) < 0) __PYX_ERR(0, 905, __pyx_L1_error)
   #if PY_VERSION_HEX < 0x030800B1
   __pyx_type_4dawg_IntDAWG.tp_print = 0;
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   #if CYTHON_COMPILING_IN_CPYTHON
   {
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+    PyObject *wrapper = PyObject_GetAttrString((PyObject *)&__pyx_type_4dawg_IntDAWG, "__init__"); if (unlikely(!wrapper)) __PYX_ERR(0, 905, __pyx_L1_error)
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@@ -22027,8 +22817,8 @@ static int __Pyx_modinit_type_init_code(void) {
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   #endif
-  if (__Pyx_SetVtable(__pyx_type_4dawg_IntDAWG.tp_dict, __pyx_vtabptr_4dawg_IntDAWG) < 0) __PYX_ERR(0, 866, __pyx_L1_error)
-  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_IntDAWG, (PyObject *)&__pyx_type_4dawg_IntDAWG) < 0) __PYX_ERR(0, 866, __pyx_L1_error)
+  if (__Pyx_SetVtable(__pyx_type_4dawg_IntDAWG.tp_dict, __pyx_vtabptr_4dawg_IntDAWG) < 0) __PYX_ERR(0, 905, __pyx_L1_error)
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_IntDAWG, (PyObject *)&__pyx_type_4dawg_IntDAWG) < 0) __PYX_ERR(0, 905, __pyx_L1_error)
   __pyx_ptype_4dawg_IntDAWG = &__pyx_type_4dawg_IntDAWG;
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@@ -22037,7 +22827,7 @@ static int __Pyx_modinit_type_init_code(void) {
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   __pyx_type_4dawg_IntCompletionDAWG.tp_base = __pyx_ptype_4dawg_CompletionDAWG;
-  if (PyType_Ready(&__pyx_type_4dawg_IntCompletionDAWG) < 0) __PYX_ERR(0, 909, __pyx_L1_error)
+  if (PyType_Ready(&__pyx_type_4dawg_IntCompletionDAWG) < 0) __PYX_ERR(0, 968, __pyx_L1_error)
   #if PY_VERSION_HEX < 0x030800B1
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@@ -22046,7 +22836,7 @@ static int __Pyx_modinit_type_init_code(void) {
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+    PyObject *wrapper = PyObject_GetAttrString((PyObject *)&__pyx_type_4dawg_IntCompletionDAWG, "__init__"); if (unlikely(!wrapper)) __PYX_ERR(0, 968, __pyx_L1_error)
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@@ -22054,10 +22844,10 @@ static int __Pyx_modinit_type_init_code(void) {
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-  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_IntCompletionDAWG, (PyObject *)&__pyx_type_4dawg_IntCompletionDAWG) < 0) __PYX_ERR(0, 909, __pyx_L1_error)
+  if (__Pyx_SetVtable(__pyx_type_4dawg_IntCompletionDAWG.tp_dict, __pyx_vtabptr_4dawg_IntCompletionDAWG) < 0) __PYX_ERR(0, 968, __pyx_L1_error)
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_IntCompletionDAWG, (PyObject *)&__pyx_type_4dawg_IntCompletionDAWG) < 0) __PYX_ERR(0, 968, __pyx_L1_error)
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-  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct__iterprefixes) < 0) __PYX_ERR(0, 256, __pyx_L1_error)
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   }
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   }
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-  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_7_iterkeys) < 0) __PYX_ERR(0, 686, __pyx_L1_error)
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   #if PY_VERSION_HEX < 0x030800B1
   __pyx_type_4dawg___pyx_scope_struct_7_iterkeys.tp_print = 0;
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   }
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-  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_8___init__) < 0) __PYX_ERR(0, 824, __pyx_L1_error)
+  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_8___init__) < 0) __PYX_ERR(0, 863, __pyx_L1_error)
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   __pyx_type_4dawg___pyx_scope_struct_8___init__.tp_print = 0;
   #endif
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   }
   __pyx_ptype_4dawg___pyx_scope_struct_8___init__ = &__pyx_type_4dawg___pyx_scope_struct_8___init__;
-  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_9_genexpr) < 0) __PYX_ERR(0, 839, __pyx_L1_error)
+  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_9_genexpr) < 0) __PYX_ERR(0, 878, __pyx_L1_error)
   #if PY_VERSION_HEX < 0x030800B1
   __pyx_type_4dawg___pyx_scope_struct_9_genexpr.tp_print = 0;
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   }
   __pyx_ptype_4dawg___pyx_scope_struct_9_genexpr = &__pyx_type_4dawg___pyx_scope_struct_9_genexpr;
-  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_10_iteritems) < 0) __PYX_ERR(0, 850, __pyx_L1_error)
+  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_10_iteritems) < 0) __PYX_ERR(0, 889, __pyx_L1_error)
   #if PY_VERSION_HEX < 0x030800B1
   __pyx_type_4dawg___pyx_scope_struct_10_iteritems.tp_print = 0;
   #endif
@@ -22145,7 +22935,7 @@ static int __Pyx_modinit_type_init_code(void) {
     __pyx_type_4dawg___pyx_scope_struct_10_iteritems.tp_getattro = __Pyx_PyObject_GenericGetAttrNoDict;
   }
   __pyx_ptype_4dawg___pyx_scope_struct_10_iteritems = &__pyx_type_4dawg___pyx_scope_struct_10_iteritems;
-  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_11__iterable_from_argument) < 0) __PYX_ERR(0, 855, __pyx_L1_error)
+  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_11__iterable_from_argument) < 0) __PYX_ERR(0, 894, __pyx_L1_error)
   #if PY_VERSION_HEX < 0x030800B1
   __pyx_type_4dawg___pyx_scope_struct_11__iterable_from_argument.tp_print = 0;
   #endif
@@ -22153,7 +22943,7 @@ static int __Pyx_modinit_type_init_code(void) {
     __pyx_type_4dawg___pyx_scope_struct_11__iterable_from_argument.tp_getattro = __Pyx_PyObject_GenericGetAttrNoDict;
   }
   __pyx_ptype_4dawg___pyx_scope_struct_11__iterable_from_argument = &__pyx_type_4dawg___pyx_scope_struct_11__iterable_from_argument;
-  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_12_genexpr) < 0) __PYX_ERR(0, 860, __pyx_L1_error)
+  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_12_genexpr) < 0) __PYX_ERR(0, 899, __pyx_L1_error)
   #if PY_VERSION_HEX < 0x030800B1
   __pyx_type_4dawg___pyx_scope_struct_12_genexpr.tp_print = 0;
   #endif
@@ -22161,7 +22951,7 @@ static int __Pyx_modinit_type_init_code(void) {
     __pyx_type_4dawg___pyx_scope_struct_12_genexpr.tp_getattro = __Pyx_PyObject_GenericGetAttrNoDict;
   }
   __pyx_ptype_4dawg___pyx_scope_struct_12_genexpr = &__pyx_type_4dawg___pyx_scope_struct_12_genexpr;
-  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_13_iteritems) < 0) __PYX_ERR(0, 971, __pyx_L1_error)
+  if (PyType_Ready(&__pyx_type_4dawg___pyx_scope_struct_13_iteritems) < 0) __PYX_ERR(0, 1030, __pyx_L1_error)
   #if PY_VERSION_HEX < 0x030800B1
   __pyx_type_4dawg___pyx_scope_struct_13_iteritems.tp_print = 0;
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@@ -22590,43 +23380,43 @@ if (!__Pyx_RefNanny) {
   __Pyx_DECREF(__pyx_t_7); __pyx_t_7 = 0;
   __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
 
-  /* "dawg.pyx":273
+  /* "dawg.pyx":291
  * 
  *     @classmethod
  *     def compile_replaces(cls, replaces):             # <<<<<<<<<<<<<<
  * 
  *         for k,v in replaces.items():
  */
-  __Pyx_GetNameInClass(__pyx_t_4, (PyObject *)__pyx_ptype_4dawg_DAWG, __pyx_n_s_compile_replaces); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 273, __pyx_L1_error)
+  __Pyx_GetNameInClass(__pyx_t_4, (PyObject *)__pyx_ptype_4dawg_DAWG, __pyx_n_s_compile_replaces); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 291, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_4);
 
-  /* "dawg.pyx":272
+  /* "dawg.pyx":290
  *             pos += 1
  * 
  *     @classmethod             # <<<<<<<<<<<<<<
  *     def compile_replaces(cls, replaces):
  * 
  */
-  __pyx_t_7 = __Pyx_Method_ClassMethod(__pyx_t_4); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 272, __pyx_L1_error)
+  __pyx_t_7 = __Pyx_Method_ClassMethod(__pyx_t_4); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 290, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_7);
   __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
-  if (PyDict_SetItem((PyObject *)__pyx_ptype_4dawg_DAWG->tp_dict, __pyx_n_s_compile_replaces, __pyx_t_7) < 0) __PYX_ERR(0, 273, __pyx_L1_error)
+  if (PyDict_SetItem((PyObject *)__pyx_ptype_4dawg_DAWG->tp_dict, __pyx_n_s_compile_replaces, __pyx_t_7) < 0) __PYX_ERR(0, 291, __pyx_L1_error)
   __Pyx_DECREF(__pyx_t_7); __pyx_t_7 = 0;
   PyType_Modified(__pyx_ptype_4dawg_DAWG);
 
-  /* "dawg.pyx":456
+  /* "dawg.pyx":474
  * # are not supported anyway because dawgdic doesn't support keys containing
  * # chr(0).
  * cdef bytes PAYLOAD_SEPARATOR = b'\x01'             # <<<<<<<<<<<<<<
  * 
  * DEF MAX_VALUE_SIZE = 32768
  */
-  __Pyx_INCREF(__pyx_kp_b__13);
+  __Pyx_INCREF(__pyx_kp_b__14);
   __Pyx_XGOTREF(__pyx_v_4dawg_PAYLOAD_SEPARATOR);
-  __Pyx_DECREF_SET(__pyx_v_4dawg_PAYLOAD_SEPARATOR, __pyx_kp_b__13);
-  __Pyx_GIVEREF(__pyx_kp_b__13);
+  __Pyx_DECREF_SET(__pyx_v_4dawg_PAYLOAD_SEPARATOR, __pyx_kp_b__14);
+  __Pyx_GIVEREF(__pyx_kp_b__14);
 
-  /* "dawg.pyx":473
+  /* "dawg.pyx":491
  *     cdef Completer* _completer
  * 
  *     def __init__(self, arg=None, input_is_sorted=False, bytes payload_separator=PAYLOAD_SEPARATOR):             # <<<<<<<<<<<<<<
@@ -22634,10 +23424,10 @@ if (!__Pyx_RefNanny) {
  *         ``arg`` must be an iterable of tuples (unicode_key, bytes_payload).
  */
   __Pyx_INCREF(__pyx_v_4dawg_PAYLOAD_SEPARATOR);
-  __pyx_k__10 = __pyx_v_4dawg_PAYLOAD_SEPARATOR;
+  __pyx_k__11 = __pyx_v_4dawg_PAYLOAD_SEPARATOR;
   __Pyx_GIVEREF(__pyx_v_4dawg_PAYLOAD_SEPARATOR);
 
-  /* "dawg.pyx":824
+  /* "dawg.pyx":863
  *     cdef _struct
  * 
  *     def __init__(self, fmt, arg=None, input_is_sorted=False, bytes payload_separator=PAYLOAD_SEPARATOR):             # <<<<<<<<<<<<<<
@@ -22645,19 +23435,19 @@ if (!__Pyx_RefNanny) {
  *         ``arg`` must be an iterable of tuples (unicode_key, data_tuple).
  */
   __Pyx_INCREF(__pyx_v_4dawg_PAYLOAD_SEPARATOR);
-  __pyx_k__12 = __pyx_v_4dawg_PAYLOAD_SEPARATOR;
+  __pyx_k__13 = __pyx_v_4dawg_PAYLOAD_SEPARATOR;
   __Pyx_GIVEREF(__pyx_v_4dawg_PAYLOAD_SEPARATOR);
 
-  /* "dawg.pyx":855
+  /* "dawg.pyx":894
  * 
  * 
  * def _iterable_from_argument(arg):             # <<<<<<<<<<<<<<
  *     if arg is None:
  *         arg = []
  */
-  __pyx_t_7 = PyCFunction_NewEx(&__pyx_mdef_4dawg_1_iterable_from_argument, NULL, __pyx_n_s_dawg); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 855, __pyx_L1_error)
+  __pyx_t_7 = PyCFunction_NewEx(&__pyx_mdef_4dawg_1_iterable_from_argument, NULL, __pyx_n_s_dawg); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 894, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_7);
-  if (PyDict_SetItem(__pyx_d, __pyx_n_s_iterable_from_argument, __pyx_t_7) < 0) __PYX_ERR(0, 855, __pyx_L1_error)
+  if (PyDict_SetItem(__pyx_d, __pyx_n_s_iterable_from_argument, __pyx_t_7) < 0) __PYX_ERR(0, 894, __pyx_L1_error)
   __Pyx_DECREF(__pyx_t_7); __pyx_t_7 = 0;
 
   /* "dawg.pyx":1
@@ -24003,6 +24793,22 @@ static CYTHON_INLINE PyObject* __Pyx_PyUnicode_Substring(
 #endif
 }
 
+/* unicode_iter */
+static CYTHON_INLINE int __Pyx_init_unicode_iteration(
+    PyObject* ustring, Py_ssize_t *length, void** data, int *kind) {
+#if CYTHON_PEP393_ENABLED
+    if (unlikely(__Pyx_PyUnicode_READY(ustring) < 0)) return -1;
+    *kind   = PyUnicode_KIND(ustring);
+    *length = PyUnicode_GET_LENGTH(ustring);
+    *data   = PyUnicode_DATA(ustring);
+#else
+    *kind   = 0;
+    *length = PyUnicode_GET_SIZE(ustring);
+    *data   = (void*)PyUnicode_AS_UNICODE(ustring);
+#endif
+    return 0;
+}
+
 /* decode_c_bytes */
 static CYTHON_INLINE PyObject* __Pyx_decode_c_bytes(
          const char* cstring, Py_ssize_t length, Py_ssize_t start, Py_ssize_t stop,
@@ -25044,6 +25850,37 @@ static CYTHON_INLINE PyObject* __Pyx_PyInt_From_long(long value) {
     }
 }
 
+/* CIntToPy */
+static CYTHON_INLINE PyObject* __Pyx_PyInt_From_dawgdic_3a__3a_ValueType(dawgdic::ValueType value) {
+    const dawgdic::ValueType neg_one = (dawgdic::ValueType) ((dawgdic::ValueType) 0 - (dawgdic::ValueType) 1), const_zero = (dawgdic::ValueType) 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (is_unsigned) {
+        if (sizeof(dawgdic::ValueType) < sizeof(long)) {
+            return PyInt_FromLong((long) value);
+        } else if (sizeof(dawgdic::ValueType) <= sizeof(unsigned long)) {
+            return PyLong_FromUnsignedLong((unsigned long) value);
+#ifdef HAVE_LONG_LONG
+        } else if (sizeof(dawgdic::ValueType) <= sizeof(unsigned PY_LONG_LONG)) {
+            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG) value);
+#endif
+        }
+    } else {
+        if (sizeof(dawgdic::ValueType) <= sizeof(long)) {
+            return PyInt_FromLong((long) value);
+#ifdef HAVE_LONG_LONG
+        } else if (sizeof(dawgdic::ValueType) <= sizeof(PY_LONG_LONG)) {
+            return PyLong_FromLongLong((PY_LONG_LONG) value);
+#endif
+        }
+    }
+    {
+        int one = 1; int little = (int)*(unsigned char *)&one;
+        unsigned char *bytes = (unsigned char *)&value;
+        return _PyLong_FromByteArray(bytes, sizeof(dawgdic::ValueType),
+                                     little, !is_unsigned);
+    }
+}
+
 /* CIntFromPy */
 static CYTHON_INLINE int __Pyx_PyInt_As_int(PyObject *x) {
     const int neg_one = (int) ((int) 0 - (int) 1), const_zero = (int) 0;
diff --git a/src/dawg.pyx b/src/dawg.pyx
index 6dba921..229d041 100644
--- a/src/dawg.pyx
+++ b/src/dawg.pyx
@@ -253,6 +253,24 @@ cdef class DAWG:
 
         return res
 
+    def longest_prefix(self, unicode key):
+        cdef BaseType index = self.dct.root()
+        cdef int pos = 1
+        cdef int lastpos = 0
+        cdef CharType ch
+
+        for ch in key:
+            if not self.dct.Follow(ch, &index):
+                break
+            if self.dct.has_value(index):
+                lastpos = pos
+            pos += 1
+
+        if lastpos:
+            return key[:lastpos]
+        else:
+            raise KeyError("No prefix found")
+
     def iterprefixes(self, unicode key):
         '''
         Return a generator with keys of this DAWG that are prefixes of the ``key``.
@@ -802,7 +820,28 @@ cdef class BytesDAWG(CompletionDAWG):
         """
         return self._similar_item_values(0, key, self.dct.root(), replaces)
 
+    def longest_prefix(self, unicode key):
+        cdef BaseType index = self.dct.root()
+        cdef BaseType tmp
+        cdef BaseType lastindex
+        cdef int pos = 1
+        cdef int lastpos = 0
+        cdef CharType ch
 
+        for ch in key:
+            if not self.dct.Follow(ch, &index):
+                break
+
+            tmp = index
+            if self.dct.Follow(self._c_payload_separator, &tmp):
+                lastpos = pos
+                lastindex = tmp
+            pos += 1
+
+        if lastpos:
+            return key[:lastpos], self._value_for_index(lastindex)
+        else:
+            raise KeyError("No prefix found")
 
 cdef class RecordDAWG(BytesDAWG):
     """
@@ -904,6 +943,26 @@ cdef class IntDAWG(DAWG):
     cpdef int b_get_value(self, bytes key):
         return self.dct.Find(key)
 
+    def longest_prefix(self, unicode key):
+        cdef BaseType index = self.dct.root()
+        cdef BaseType lastindex
+        cdef int pos = 1
+        cdef int lastpos = 0
+        cdef CharType ch
+
+        for ch in key:
+            if not self.dct.Follow(ch, &index):
+                break
+
+            if self.dct.has_value(index):
+                lastpos = pos
+                lastindex = index
+            pos += 1
+
+        if lastpos:
+            return key[:lastpos], self.dct.value(lastindex)
+        else:
+            raise KeyError("No prefix found")
 
 # FIXME: code duplication.
 cdef class IntCompletionDAWG(CompletionDAWG):
diff --git a/tests/test_dawg.py b/tests/test_dawg.py
index 26f6627..92baa4b 100644
--- a/tests/test_dawg.py
+++ b/tests/test_dawg.py
@@ -83,7 +83,12 @@ def test_unicode_sorting(self):
         # if data is sorted according to unicode rules.
         dawg.DAWG([key1, key2])
 
-
+    def test_longest_prefix(self):
+        d = dawg.DAWG(["a", "as", "asdf"])
+        assert d.longest_prefix("a") == "a"
+        assert d.longest_prefix("as") == "as"
+        assert d.longest_prefix("asd") == "as"
+        assert d.longest_prefix("asdf") == "asdf"
 
 class TestIntDAWG(object):
 
@@ -148,6 +153,13 @@ def test_int_value_ranges(self):
         with pytest.raises(OverflowError):
             self.IntDAWG({'f': 2**32-1})
 
+    def test_longest_prefix(self):
+        d = dawg.IntDAWG([("a", 1), ("as", 2), ("asdf", 3)])
+        assert d.longest_prefix("a") == ("a", 1)
+        assert d.longest_prefix("as") == ("as", 2)
+        assert d.longest_prefix("asd") == ("as", 2)
+        assert d.longest_prefix("asdf") == ("asdf", 3)
+
 
 class TestIntCompletionDAWG(TestIntDAWG):
     IntDAWG = dawg.IntCompletionDAWG  # checks that all tests for IntDAWG pass
diff --git a/tests/test_payload_dawg.py b/tests/test_payload_dawg.py
index 305ac3f..a8b2b1b 100644
--- a/tests/test_payload_dawg.py
+++ b/tests/test_payload_dawg.py
@@ -83,7 +83,12 @@ def test_build_error(self):
         with pytest.raises(dawg.Error):
             self.dawg(payload_separator=b'f')
 
-
+    def test_longest_prefix(self):
+        d = dawg.BytesDAWG([("a", b"a1"), ("a", b"a2"), ("as", b"as"), ("asdf", b"asdf")])
+        assert d.longest_prefix("a") == ("a", [b"a1", b"a2"])
+        assert d.longest_prefix("as") == ("as", [b"as"])
+        assert d.longest_prefix("asd") == ("as", [b"as"])
+        assert d.longest_prefix("asdf") == ("asdf", [b"asdf"])
 
 class TestRecordDAWG(object):