fix: Add pointer support for url query params (#3659) (#3666)

The pointer support in url query params (using []*Struct for binding query params) was previously available in Gin, but was removed in commit 0d50ce8 since there wasn't a test case for such a scenario, and so the case block was removed as a redundant one.

binding/form_mapping.go

@@ -239,6 +239,11 @@ func setWithProperType(val string, value reflect.Value, field reflect.StructFiel
 		return json.Unmarshal(bytesconv.StringToBytes(val), value.Addr().Interface())
 	case reflect.Map:
 		return json.Unmarshal(bytesconv.StringToBytes(val), value.Addr().Interface())
+	case reflect.Ptr:
+		if !value.Elem().IsValid() {
+			value.Set(reflect.New(value.Type().Elem()))
+		}
+		return setWithProperType(val, value.Elem(), field)
 	default:
 		return errUnknownType
 	}