Apply goext specific patches to gojson

gojson/decode.go

@@ -217,6 +217,7 @@ type decodeState struct {
 	savedError            error
 	useNumber             bool
 	disallowUnknownFields bool
+	tagkey                *string
 }
 
 // readIndex returns the position of the last byte read.
@@ -643,7 +644,11 @@ func (d *decodeState) object(v reflect.Value) error {
 			v.Set(reflect.MakeMap(t))
 		}
 	case reflect.Struct:
-		fields = cachedTypeFields(t)
+		tagkey := "json"
+		if d.tagkey != nil {
+			tagkey = *d.tagkey
+		}
+		fields = cachedTypeFields(t, tagkey)
 		// ok
 	default:
 		d.saveError(&UnmarshalTypeError{Value: "object", Type: t, Offset: int64(d.off)})