improve package gtime/gconv for map converting

os/gtime/gtime_time.go

@@ -14,7 +14,7 @@ import (
 
 // Time is a wrapper for time.Time for additional features.
 type Time struct {
-	TimeWrapper
+	wrapper
 }
 
 // apiUnixNano is an interface definition commonly for custom time.Time wrapper.
@@ -47,21 +47,21 @@ func New(param ...interface{}) *Time {
 		}
 	}
 	return &Time{
-		TimeWrapper{time.Time{}},
+		wrapper{time.Time{}},
 	}
 }
 
 // Now creates and returns a time object of now.
 func Now() *Time {
 	return &Time{
-		TimeWrapper{time.Now()},
+		wrapper{time.Now()},
 	}
 }
 
 // NewFromTime creates and returns a Time object with given time.Time object.
 func NewFromTime(t time.Time) *Time {
 	return &Time{
-		TimeWrapper{t},
+		wrapper{t},
 	}
 }
 
@@ -112,7 +112,7 @@ func NewFromTimeStamp(timestamp int64) *Time {
 		sec = timestamp
 	}
 	return &Time{
-		TimeWrapper{time.Unix(sec, nano)},
+		wrapper{time.Unix(sec, nano)},
 	}
 }
 

os/gtime/gtime_time_wrapper.go

@@ -10,14 +10,14 @@ import (
 	"time"
 )
 
-// TimeWrapper is a wrapper for stdlib struct time.Time.
+// wrapper is a wrapper for stdlib struct time.Time.
 // It's used for overwriting some functions of time.Time, for example: String.
-type TimeWrapper struct {
+type wrapper struct {
 	time.Time
 }
 
 // String overwrites the String function of time.Time.
-func (t TimeWrapper) String() string {
+func (t wrapper) String() string {
 	if t.IsZero() {
 		return ""
 	}

os/gtime/gtime_z_unit_time_test.go

@@ -75,7 +75,7 @@ func Test_String(t *testing.T) {
 
 		t2 := *t1
 		t.Assert(t2.String(), "2006-01-02 15:04:05")
-		t.Assert(fmt.Sprintf("%s", t2), "{2006-01-02 15:04:05}")
+		t.Assert(fmt.Sprintf("{%s}", t2.String()), "{2006-01-02 15:04:05}")
 	})
 }
 

util/gconv/gconv_map.go

@@ -117,8 +117,14 @@ func doMapConvert(value interface{}, recursive bool, tags ...string) map[string]
 			dataMap[k] = v
 		}
 	case map[string]interface{}:
-		for k, v := range r {
-			dataMap[k] = doMapConvertForMapOrStructValue(false, v, recursive, newTags...)
+		if recursive {
+			// A copy of current map.
+			for k, v := range r {
+				dataMap[k] = doMapConvertForMapOrStructValue(false, v, recursive, newTags...)
+			}
+		} else {
+			// It returns the map directly without any changing.
+			return r
 		}
 	case map[int]interface{}:
 		for k, v := range r {