feat(binding): add DisallowUnknownFields() in gin.Context.BindJSON() (#2028)

mode.go

@@ -71,12 +71,18 @@ func DisableBindValidation() {
 	binding.Validator = nil
 }
 
-// EnableJsonDecoderUseNumber sets true for binding.EnableDecoderUseNumberto to
+// EnableJsonDecoderUseNumber sets true for binding.EnableDecoderUseNumber to
 // call the UseNumber method on the JSON Decoder instance.
 func EnableJsonDecoderUseNumber() {
 	binding.EnableDecoderUseNumber = true
 }
 
+// EnableJsonDisallowUnknownFields sets true for binding.EnableDecoderDisallowUnknownFields to
+// call the DisallowUnknownFields method on the JSON Decoder instance.
+func EnableJsonDecoderDisallowUnknownFields() {
+	binding.EnableDecoderDisallowUnknownFields = true
+}
+
 // Mode returns currently gin mode.
 func Mode() string {
 	return modeName