diff --git a/README.md b/README.md
index 4998c0a..9e86053 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,6 @@
 [![PkgGoDev](https://pkg.go.dev/badge/github.com/shockerli/cvt)](https://pkg.go.dev/github.com/shockerli/cvt)
 [![Go Report Card](https://goreportcard.com/badge/github.com/shockerli/cvt)](https://goreportcard.com/report/github.com/shockerli/cvt)
 [![Build Status](https://travis-ci.com/shockerli/cvt.svg?branch=master)](https://travis-ci.com/shockerli/cvt)
-![GitHub top language](https://img.shields.io/github/languages/top/shockerli/cvt)
 [![codecov](https://codecov.io/gh/shockerli/cvt/branch/master/graph/badge.svg)](https://codecov.io/gh/shockerli/cvt)
 ![GitHub](https://img.shields.io/github/license/shockerli/cvt)
 [![Mentioned in Awesome Go](https://awesome.re/mentioned-badge.svg)](https://github.com/avelino/awesome-go)
diff --git a/README_ZH.md b/README_ZH.md
index 03d12e7..873d6ad 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -3,7 +3,6 @@
 [![PkgGoDev](https://pkg.go.dev/badge/github.com/shockerli/cvt)](https://pkg.go.dev/github.com/shockerli/cvt)
 [![Go Report Card](https://goreportcard.com/badge/github.com/shockerli/cvt)](https://goreportcard.com/report/github.com/shockerli/cvt)
 [![Build Status](https://travis-ci.com/shockerli/cvt.svg?branch=master)](https://travis-ci.com/shockerli/cvt)
-![GitHub top language](https://img.shields.io/github/languages/top/shockerli/cvt)
 [![codecov](https://codecov.io/gh/shockerli/cvt/branch/master/graph/badge.svg)](https://codecov.io/gh/shockerli/cvt)
 ![GitHub](https://img.shields.io/github/license/shockerli/cvt)
 [![Mentioned in Awesome Go](https://awesome.re/mentioned-badge.svg)](https://github.com/avelino/awesome-go)
diff --git a/int_test.go b/int_test.go
index a0d8214..c1be868 100644
--- a/int_test.go
+++ b/int_test.go
@@ -977,6 +977,8 @@ func TestUint64E(t *testing.T) {
 		{"8", 8, false},
 		{"8.00", 8, false},
 		{"8.01", 8, false},
+		{"00100", 100, false},
+		{"00100.01", 100, false},
 		{[]byte("8"), 8, false},
 		{[]byte("8.00"), 8, false},
 		{[]byte("8.01"), 8, false},
@@ -1098,6 +1100,8 @@ func TestUint32E(t *testing.T) {
 		{"8", 8, false},
 		{"8.00", 8, false},
 		{"8.01", 8, false},
+		{"00100", 100, false},
+		{"00100.01", 100, false},
 		{nil, 0, false},
 		{aliasTypeInt0, 0, false},
 		{&aliasTypeInt0, 0, false},
@@ -1212,6 +1216,8 @@ func TestUint16E(t *testing.T) {
 		{"8", 8, false},
 		{"8.00", 8, false},
 		{"8.01", 8, false},
+		{"00100", 100, false},
+		{"00100.01", 100, false},
 		{nil, 0, false},
 		{aliasTypeInt0, 0, false},
 		{&aliasTypeInt0, 0, false},
@@ -1328,6 +1334,8 @@ func TestUint8E(t *testing.T) {
 		{"8", 8, false},
 		{"8.00", 8, false},
 		{"8.01", 8, false},
+		{"00100", 100, false},
+		{"00100.01", 100, false},
 		{nil, 0, false},
 		{aliasTypeInt0, 0, false},
 		{&aliasTypeInt0, 0, false},
@@ -1444,6 +1452,8 @@ func TestUintE(t *testing.T) {
 		{"8", 8, false},
 		{"8.00", 8, false},
 		{"8.01", 8, false},
+		{"00100", 100, false},
+		{"00100.01", 100, false},
 		{uint64(math.MaxUint32), uint(math.MaxUint32), false},
 		{uint32(math.MaxUint32), uint(math.MaxUint32), false},
 		{nil, 0, false},
@@ -1567,11 +1577,17 @@ func TestInt64E(t *testing.T) {
 		{"8", 8, false},
 		{"8.00", 8, false},
 		{"8.01", 8, false},
+		{"00100", 100, false},
+		{"-00100", -100, false},
+		{"00100.00", 100, false},
+		{"-00100.01", -100, false},
 		{[]byte("-8"), -8, false},
 		{[]byte("-8.01"), -8, false},
 		{[]byte("8"), 8, false},
 		{[]byte("8.00"), 8, false},
 		{[]byte("8.01"), 8, false},
+		{math.MaxInt64, math.MaxInt64, false},
+		{math.MinInt64, math.MinInt64, false},
 		{uint32(math.MaxUint32), int64(math.MaxUint32), false},
 		{nil, 0, false},
 		{aliasTypeInt0, 0, false},
@@ -1689,12 +1705,17 @@ func TestInt32E(t *testing.T) {
 		{"8", 8, false},
 		{"8.00", 8, false},
 		{"8.01", 8, false},
+		{"00100", 100, false},
+		{"-00100", -100, false},
+		{"00100.00", 100, false},
+		{"-00100.01", -100, false},
 		{[]byte("-8"), -8, false},
 		{[]byte("-8.01"), -8, false},
 		{[]byte("8"), 8, false},
 		{[]byte("8.00"), 8, false},
 		{[]byte("8.01"), 8, false},
 		{math.MaxInt32, int32(math.MaxInt32), false},
+		{math.MinInt32, int32(math.MinInt32), false},
 		{nil, 0, false},
 		{aliasTypeInt0, 0, false},
 		{&aliasTypeInt0, 0, false},
@@ -1808,12 +1829,17 @@ func TestInt16E(t *testing.T) {
 		{"8", 8, false},
 		{"8.00", 8, false},
 		{"8.01", 8, false},
+		{"00100", 100, false},
+		{"-00100", -100, false},
+		{"00100.00", 100, false},
+		{"-00100.01", -100, false},
 		{[]byte("-8"), -8, false},
 		{[]byte("-8.01"), -8, false},
 		{[]byte("8"), 8, false},
 		{[]byte("8.00"), 8, false},
 		{[]byte("8.01"), 8, false},
 		{math.MaxInt16, int16(math.MaxInt16), false},
+		{math.MinInt16, int16(math.MinInt16), false},
 		{nil, 0, false},
 		{aliasTypeInt0, 0, false},
 		{&aliasTypeInt0, 0, false},
@@ -1929,12 +1955,17 @@ func TestInt8E(t *testing.T) {
 		{"8", 8, false},
 		{"8.00", 8, false},
 		{"8.01", 8, false},
+		{"00100", 100, false},
+		{"-00100", -100, false},
+		{"00100.00", 100, false},
+		{"-00100.01", -100, false},
 		{[]byte("-8"), -8, false},
 		{[]byte("-8.01"), -8, false},
 		{[]byte("8"), 8, false},
 		{[]byte("8.00"), 8, false},
 		{[]byte("8.01"), 8, false},
 		{int8(math.MaxInt8), math.MaxInt8, false},
+		{int8(math.MinInt8), math.MinInt8, false},
 		{nil, 0, false},
 		{aliasTypeInt0, 0, false},
 		{&aliasTypeInt0, 0, false},
@@ -2051,12 +2082,16 @@ func TestIntE(t *testing.T) {
 		{"8", 8, false},
 		{"8.00", 8, false},
 		{"8.01", 8, false},
+		{"00100", 100, false},
+		{"-00100", -100, false},
+		{"00100.00", 100, false},
+		{"-00100.01", -100, false},
 		{[]byte("-8"), -8, false},
 		{[]byte("-8.01"), -8, false},
 		{[]byte("8"), 8, false},
 		{[]byte("8.00"), 8, false},
 		{[]byte("8.01"), 8, false},
-		{int(math.MaxInt32), int(math.MaxInt32), false},
+		{math.MaxInt32, math.MaxInt32, false},
 		{nil, 0, false},
 		{aliasTypeInt0, 0, false},
 		{&aliasTypeInt0, 0, false},
diff --git a/map.go b/map.go
index 1eafb81..2e647b2 100644
--- a/map.go
+++ b/map.go
@@ -15,6 +15,19 @@ func StringMapE(val interface{}) (m map[string]interface{}, err error) {
 		return nil, errUnsupportedTypeNil
 	}
 
+	// direct type(for improve performance)
+	switch v := val.(type) {
+	case map[string]interface{}:
+		return v, nil
+	case []byte:
+		err = json.Unmarshal(v, &m)
+		return
+	case string:
+		err = json.Unmarshal([]byte(v), &m)
+		return
+	}
+
+	// indirect type
 	_, rv := indirect(val)
 	switch rv.Kind() {
 	case reflect.Map:
@@ -23,6 +36,11 @@ func StringMapE(val interface{}) (m map[string]interface{}, err error) {
 		}
 	case reflect.Struct:
 		m = struct2map(rv)
+	case reflect.Slice:
+		// []byte
+		if rv.Type().Elem().Kind() == reflect.Uint8 {
+			err = json.Unmarshal(rv.Bytes(), &m)
+		}
 	case reflect.String:
 		// JSON string of map
 		err = json.Unmarshal([]byte(rv.String()), &m)
diff --git a/map_test.go b/map_test.go
index 2e669dc..c0f470f 100644
--- a/map_test.go
+++ b/map_test.go
@@ -12,10 +12,13 @@ func TestStringMapE(t *testing.T) {
 		expect map[string]interface{}
 		isErr  bool
 	}{
-		// JSON String
+		// JSON
 		{`{"name":"cvt","age":3.21}`, map[string]interface{}{"name": "cvt", "age": 3.21}, false},
 		{`{"name":"cvt","tag":"convert"}`, map[string]interface{}{"name": "cvt", "tag": "convert"}, false},
 		{`{"name":"cvt","build":true}`, map[string]interface{}{"name": "cvt", "build": true}, false},
+		{[]byte(`{"name":"cvt","build":true}`), map[string]interface{}{"name": "cvt", "build": true}, false},
+		{AliasTypeString(`{"name":"cvt","build":true}`), map[string]interface{}{"name": "cvt", "build": true}, false},
+		{AliasTypeBytes(`{"name":"cvt","build":true}`), map[string]interface{}{"name": "cvt", "build": true}, false},
 
 		// Map
 		{map[string]interface{}{}, map[string]interface{}{}, false},