diff --git a/decode_bool.go b/decode_bool.go
index 84a4a3d..d818896 100644
--- a/decode_bool.go
+++ b/decode_bool.go
@@ -13,54 +13,6 @@ func newBoolDecoder(structName, fieldName string) *boolDecoder {
 	return &boolDecoder{structName: structName, fieldName: fieldName}
 }
 
-func trueBytes(s *stream) error {
-	if s.cursor+3 >= s.length {
-		if !s.read() {
-			return errInvalidCharacter(s.char(), "bool(true)", s.totalOffset())
-		}
-	}
-	s.cursor++
-	if s.char() != 'r' {
-		return errInvalidCharacter(s.char(), "bool(true)", s.totalOffset())
-	}
-	s.cursor++
-	if s.char() != 'u' {
-		return errInvalidCharacter(s.char(), "bool(true)", s.totalOffset())
-	}
-	s.cursor++
-	if s.char() != 'e' {
-		return errInvalidCharacter(s.char(), "bool(true)", s.totalOffset())
-	}
-	s.cursor++
-	return nil
-}
-
-func falseBytes(s *stream) error {
-	if s.cursor+4 >= s.length {
-		if !s.read() {
-			return errInvalidCharacter(s.char(), "bool(false)", s.totalOffset())
-		}
-	}
-	s.cursor++
-	if s.char() != 'a' {
-		return errInvalidCharacter(s.char(), "bool(false)", s.totalOffset())
-	}
-	s.cursor++
-	if s.char() != 'l' {
-		return errInvalidCharacter(s.char(), "bool(false)", s.totalOffset())
-	}
-	s.cursor++
-	if s.char() != 's' {
-		return errInvalidCharacter(s.char(), "bool(false)", s.totalOffset())
-	}
-	s.cursor++
-	if s.char() != 'e' {
-		return errInvalidCharacter(s.char(), "bool(false)", s.totalOffset())
-	}
-	s.cursor++
-	return nil
-}
-
 func (d *boolDecoder) decodeStream(s *stream, depth int64, p unsafe.Pointer) error {
 	s.skipWhiteSpace()
 	for {
diff --git a/decode_stream.go b/decode_stream.go
index 257b8fc..b1c99f9 100644
--- a/decode_stream.go
+++ b/decode_stream.go
@@ -313,3 +313,102 @@ func (s *stream) skipValue(depth int64) error {
 		cursor++
 	}
 }
+
+func nullBytes(s *stream) error {
+	// current cursor's character is 'n'
+	s.cursor++
+	if s.char() != 'u' {
+		if err := retryReadNull(s); err != nil {
+			return err
+		}
+	}
+	s.cursor++
+	if s.char() != 'l' {
+		if err := retryReadNull(s); err != nil {
+			return err
+		}
+	}
+	s.cursor++
+	if s.char() != 'l' {
+		if err := retryReadNull(s); err != nil {
+			return err
+		}
+	}
+	s.cursor++
+	return nil
+}
+
+func retryReadNull(s *stream) error {
+	if s.char() == nul && s.read() {
+		return nil
+	}
+	return errInvalidCharacter(s.char(), "null", s.totalOffset())
+}
+
+func trueBytes(s *stream) error {
+	// current cursor's character is 't'
+	s.cursor++
+	if s.char() != 'r' {
+		if err := retryReadTrue(s); err != nil {
+			return err
+		}
+	}
+	s.cursor++
+	if s.char() != 'u' {
+		if err := retryReadTrue(s); err != nil {
+			return err
+		}
+	}
+	s.cursor++
+	if s.char() != 'e' {
+		if err := retryReadTrue(s); err != nil {
+			return err
+		}
+	}
+	s.cursor++
+	return nil
+}
+
+func retryReadTrue(s *stream) error {
+	if s.char() == nul && s.read() {
+		return nil
+	}
+	return errInvalidCharacter(s.char(), "bool(true)", s.totalOffset())
+}
+
+func falseBytes(s *stream) error {
+	// current cursor's character is 'f'
+	s.cursor++
+	if s.char() != 'a' {
+		if err := retryReadFalse(s); err != nil {
+			return err
+		}
+	}
+	s.cursor++
+	if s.char() != 'l' {
+		if err := retryReadFalse(s); err != nil {
+			return err
+		}
+	}
+	s.cursor++
+	if s.char() != 's' {
+		if err := retryReadFalse(s); err != nil {
+			return err
+		}
+	}
+	s.cursor++
+	if s.char() != 'e' {
+		if err := retryReadFalse(s); err != nil {
+			return err
+		}
+	}
+	s.cursor++
+	return nil
+}
+
+func retryReadFalse(s *stream) error {
+	if s.char() == nul && s.read() {
+		return nil
+	}
+	return errInvalidCharacter(s.char(), "bool(false)", s.totalOffset())
+}
diff --git a/decode_string.go b/decode_string.go
index e87222e..c258257 100644
--- a/decode_string.go
+++ b/decode_string.go
@@ -233,28 +233,6 @@ ERROR:
 	return nil, errUnexpectedEndOfJSON("string", s.totalOffset())
 }
 
-func nullBytes(s *stream) error {
-	if s.cursor+3 >= s.length {
-		if !s.read() {
-			return errInvalidCharacter(s.char(), "null", s.totalOffset())
-		}
-	}
-	s.cursor++
-	if s.char() != 'u' {
-		return errInvalidCharacter(s.char(), "null", s.totalOffset())
-	}
-	s.cursor++
-	if s.char() != 'l' {
-		return errInvalidCharacter(s.char(), "null", s.totalOffset())
-	}
-	s.cursor++
-	if s.char() != 'l' {
-		return errInvalidCharacter(s.char(), "null", s.totalOffset())
-	}
-	s.cursor++
-	return nil
-}
-
 func (d *stringDecoder) decodeStreamByte(s *stream) ([]byte, error) {
 	for {
 		switch s.char() {
diff --git a/json_test.go b/json_test.go
index 47a6c38..869b783 100644
--- a/json_test.go
+++ b/json_test.go
@@ -32,6 +32,15 @@ func TestValid(t *testing.T) {
 	}
 }
 
+func TestValidWithComplexData(t *testing.T) {
+	data := []byte(`{"ABCDEFGHIJKL":[{"MNOPQRSTUVWX":[{"YABC":{"DEFG":[{"HIJKLMNO":{"PQRS":"TUVWXYABCDEFGHIJKLMNOPQRSTUVWXYABCDEFGHIJKLMNOPQRSTUVWXYABCDE","FGHIJKLM":"NOPQRSTUVW"},"XYABCDEFGH":[{"IJKLMNOP":"!=","Q":{"RSTU":"V","WXYABCDE":"FGHIJKLMNO"},"P":{"QRSTUVWX":"YAB"},"CDEFGHIJ":"KLMNOP","QRSTUVWX":"YABCDEFGHI"}],"JKLMNOPQRSTUVW":null,"XYABCDEF":"GHIJ"},{"KLMNOPQR":{"STUVWXY":{"ABCDEFGH":"IJKLMN_OPQ_RST","U":{"VWXY":"A","BCDEFGHI":"JKLMNOPQRS"},"TUVWXYAB":"CDEFG","HIJKLMNO":"PQRSTUVWXY"},"ABCDEFGH":"IJKLMNOP!Q41R8ST98U00V204W9800998XYA8427B","CDEFGHIJ":"KLMNOP","QRSTUVWX":"YABCDEFGHI"},"JKLMNOPQRS":null,"TUVWXYABCDEFGH":null,"IJKLMNOP":"QRST"}],"UVWXYABC":"DEFGH","IJKLMNOP":"QRSTUVWXY"},"ABCDEFGH":9,"IJKL":"MNOPQRST/UVWXYABCDE//FGHIJKLMNOPQRST!4UV2WXYABC7826D7659EF223GH40I91J","KLMNOPQRST":[{"UVWXYABCDEFG":null,"HIJKLMNO":0,"PQRS":"T","UVWX":{"YABC":{"DEFG":"HIJK/LMNO/PQRSTU","VWXYABCD":"EFGHIJKLM","NOPQRSTU":"VWXY"},"ABCDEFGH":"IJKLMNO","PQRSTUVW":"XYAB"},"CDEFGHIJ":"KLMNOPQR"}],"STUVWXYA":null,"BCDEFGH":null,"IJKLMN":null,"OPQRSTUVWXYABC":null,"DEFGHIJK":"LMNOPQRS"},{"TUVW":{"XYAB":[{"CDEFGHIJ":{"KLMN":"OPQRSTUV/WXYABCDEFG//HIJKLMNOPQRSTUV!4WX2YABCDE7826F7659GH223IJ40K91L","MNOPQRST":"UVWXYABCDE"},"FGHIJKLMNO":[{"PQRS":"T","UVWXYABC":"DEFGHIJKLM"}],"NOPQRSTUVWXYAB":null,"CDEFGHIJ":"KLMN"}],"OPQRSTUV":"WXYAB","CDEFGHIJ":"KLMNOPQRS"},"TUVWXYAB":9,"CDEF":"GHIJKLMN/OPQRSTUVWX//YABCDEFGHIJKLM!4NO2PQRSTU7826V7659WX223YA40B91C","DEFGHIJKLM":[{"NOPQRSTUVWXY":null,"ABCDEFGH":0,"IJKL":"M","NOPQ":{"RSTU":{"VWXY":"ABCD/EFGH/IJKLMN","OPQRSTUV":"WXYABCDEF","GHIJKLMN":"OPQR"},"STUVWXYA":"BCDEFGH","IJKLMNOP":"QRST"},"UVWXYABC":"DEFGHIJK"}],"LMNOPQRS":null,"TUVWXYA":null,"BCDEFG":null,"HIJKLMNOPQRSTU":null,"VWXYABCD":"EFGHIJKL"},{"MNOP":{"QRST":[{"UVWXYABC":0,"DEFG":["HIJK"],"LMNO":[{"PQRS":{"TUVW":"XYABCDEF/GHIJKLMNOP","QRSTUVWX":"YABCDEFGH","IJKLMNOP":"QRST"},"UVWXYABC":"DEFGHIJ","KLMNOPQR":"STUV"}],"WXYAB":[{"CDEF":{"GHIJ":{"KLMN":"OPQRSTUV/WXYABCDEFG","HIJKLMNO":"PQRSTUVWX","YABCDEFG":"HIJK"},"LMNOPQRS":"TUVWXYA","BCDEFGHI":"JKLM"},"NOPQRSTU":"VWX"}],"YABCDEFG":"HIJKLMNOPQR","STUVWXYA":"BCDEFGHIJ"},{"KLMNOPQR":"=","S":{"TUVWXYA":{"BCDE":"FGHI","JKLMNOPQ":"RSTUVWXYAB"},"CDEFGHIJ":"@KLMN/OPQR/STUVWX","YABCDEFG":"HIJKLM","NOPQRSTU":"VWXYABCDEF"},"G":{"HIJKLMNO":{"PQRS":"TUVW/XYAB/CDEFGH//IJKLMN!O41P8QR98S00T204U9800998VWX8427Y","ABCDEFGH":"IJKLMNOPQR"},"STUVWXYABC":null,"DEFGHIJKLMNOPQ":null,"RSTUVWXY":"ABCD"},"EFGHIJKL":"MNOPQR","STUVWXYA":"BCDEFGHIJK"},{"LMNOPQR":[{"STUV":"WXYA","BCDEFGHI":"JKLMNOPQRS"}],"TUVWXYAB":"CDEFGH","IJKLMNOP":"QRSTUVWXY"}],"ABCDEFGH":"IJKLM","NOPQRSTU":"VWXYABCDE"},"FGHIJKLM":37,"NOPQ":"RSTUVWXY/ABCDEFGHIJ//KLMNOPQRST!U41V8WX98Y00A204B9800998CDE8427F","GHIJKLMNOP":null,"QRSTUVWX":null,"YABCDEF":[{"GHIJKLMNOPQR":null,"STUVWXYA":0,"BCDE":"","FGHI":{"JKLM":{"NOPQ":"RSTUVWXY/ABCDEFGHIJ","KLMNOPQR":"STUVWXYAB","CDEFGHIJ":"KLMN"},"OPQRSTUV":"WXYABCD","EFGHIJKL":"MNOP"},"QRSTUVWX":"YABCDEFG"}],"HIJKLM":null,"NOPQRSTUVWXYAB":null,"CDEFGHIJ":"KLMNOPQR"}],"STUVWXYABC":null,"DEFGHIJK":[{"LMNO":{"PQRS":"TUVW/XYAB/CDEFGH","IJKLMNOP":"QRSTUVWXY","ABCDEFGH":"IJKL"},"MNOPQRST":"UVWXYAB","CDEFGHIJ":"KLMN"}],"OPQRSTUV":1,"WXYA":"BCDEFGHI/JKLMNOPQRS","TUVWXYAB":null,"CDEFGHIJKLMNOP":null,"QRSTUVWX":"YABCDE","FGHIJKLM":"NOPQ"}]}`)
+	expected := stdjson.Valid(data)
+	actual := json.Valid(data)
+	if expected != actual {
+		t.Fatalf("failed to valid: expected %v but got %v", expected, actual)
+	}
+}
+
 type example struct {
 	compact string
 	indent  string