Performance improvement can be made for `Marshaler.Get`.

[sean2077]

Performance improvement can be made for Marshaler.Get.

Here []bytes(v) can be replace with String2Bytes(v) cast funciton.

func String2Bytes(s string) []byte {
	sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
	bh := reflect.SliceHeader{
		Data: sh.Data,
		Len:  sh.Len,
		Cap:  sh.Len,
	}
	return *(*[]byte)(unsafe.Pointer(&bh))
}