diff --git a/reflect_json_number.go b/reflect_json_number.go
index 98d45c1e..4cc332f4 100644
--- a/reflect_json_number.go
+++ b/reflect_json_number.go
@@ -2,46 +2,27 @@ package jsoniter
 
 import (
 	"encoding/json"
-	"github.com/modern-go/reflect2"
-	"strconv"
 	"unsafe"
-)
-
-type Number string
-
-// String returns the literal text of the number.
-func (n Number) String() string { return string(n) }
 
-// Float64 returns the number as a float64.
-func (n Number) Float64() (float64, error) {
-	return strconv.ParseFloat(string(n), 64)
-}
+	"github.com/modern-go/reflect2"
+)
 
-// Int64 returns the number as an int64.
-func (n Number) Int64() (int64, error) {
-	return strconv.ParseInt(string(n), 10, 64)
-}
+type Number = json.Number
 
 func CastJsonNumber(val interface{}) (string, bool) {
 	switch typedVal := val.(type) {
 	case json.Number:
 		return string(typedVal), true
-	case Number:
-		return string(typedVal), true
 	}
 	return "", false
 }
 
 var jsonNumberType = reflect2.TypeOfPtr((*json.Number)(nil)).Elem()
-var jsoniterNumberType = reflect2.TypeOfPtr((*Number)(nil)).Elem()
 
 func createDecoderOfJsonNumber(ctx *ctx, typ reflect2.Type) ValDecoder {
 	if typ.AssignableTo(jsonNumberType) {
 		return &jsonNumberCodec{}
 	}
-	if typ.AssignableTo(jsoniterNumberType) {
-		return &jsoniterNumberCodec{}
-	}
 	return nil
 }
 
@@ -49,9 +30,6 @@ func createEncoderOfJsonNumber(ctx *ctx, typ reflect2.Type) ValEncoder {
 	if typ.AssignableTo(jsonNumberType) {
 		return &jsonNumberCodec{}
 	}
-	if typ.AssignableTo(jsoniterNumberType) {
-		return &jsoniterNumberCodec{}
-	}
 	return nil
 }
 
@@ -82,31 +60,3 @@ func (codec *jsonNumberCodec) Encode(ptr unsafe.Pointer, stream *Stream) {
 func (codec *jsonNumberCodec) IsEmpty(ptr unsafe.Pointer) bool {
 	return len(*((*json.Number)(ptr))) == 0
 }
-
-type jsoniterNumberCodec struct {
-}
-
-func (codec *jsoniterNumberCodec) Decode(ptr unsafe.Pointer, iter *Iterator) {
-	switch iter.WhatIsNext() {
-	case StringValue:
-		*((*Number)(ptr)) = Number(iter.ReadString())
-	case NilValue:
-		iter.skipFourBytes('n', 'u', 'l', 'l')
-		*((*Number)(ptr)) = ""
-	default:
-		*((*Number)(ptr)) = Number([]byte(iter.readNumberAsString()))
-	}
-}
-
-func (codec *jsoniterNumberCodec) Encode(ptr unsafe.Pointer, stream *Stream) {
-	number := *((*Number)(ptr))
-	if len(number) == 0 {
-		stream.writeByte('0')
-	} else {
-		stream.WriteRaw(string(number))
-	}
-}
-
-func (codec *jsoniterNumberCodec) IsEmpty(ptr unsafe.Pointer) bool {
-	return len(*((*Number)(ptr))) == 0
-}