Fix error in With function signature and add test case for With function

errors.go

@@ -133,7 +133,7 @@ func (x *Error) Unwrap() error {
 }
 
 // With adds key and value related to the error event
-func (x *Error) With(key string, value any) *Error {
+func (x *Error) With(key, value any) *Error {
 	x.values[key] = value
 	return x
 }

test/errors_test.go

@@ -113,3 +113,9 @@ func TestLoggingNestedError(t *testing.T) {
 	assert.Contains(t, out.String(), `"number":"five"`)
 	assert.Contains(t, out.String(), `"color":"orange"`)
 }
+
+func TestWithAnyKey(t *testing.T) {
+	type myKey struct{}
+	err := goerr.New("e1").With(myKey{}, "orange")
+	assert.Equal(t, "orange", err.Values()[myKey{}])
+}