Add support to ++/-- for objects castable to _IS_NUMBER

Author: Girgias

Zend/tests/in-de-crement/decrement_with_castable_objects_no_subtraction.phpt

@@ -72,5 +72,5 @@ int(51)
 float(57.3)
 Cannot decrement LongCastableNoOperations
 Cannot decrement FloatCastableNoOperations
-Cannot decrement NumericCastableNoOperations
-Cannot decrement NumericCastableNoOperations
+int(51)
+float(57.3)

Zend/tests/in-de-crement/increment_with_castable_objects_no_addition.phpt

@@ -72,5 +72,5 @@ int(53)
 float(59.3)
 Cannot increment LongCastableNoOperations
 Cannot increment FloatCastableNoOperations
-Cannot increment NumericCastableNoOperations
-Cannot increment NumericCastableNoOperations
+int(53)
+float(59.3)

Zend/zend_operators.c

@@ -2540,15 +2540,23 @@ ZEND_API zend_result ZEND_FASTCALL increment_function(zval *op1) /* {{{ */
 		case IS_REFERENCE:
 			op1 = Z_REFVAL_P(op1);
 			goto try_again;
-		case IS_OBJECT:
+		case IS_OBJECT: {
 			if (Z_OBJ_HANDLER_P(op1, do_operation)) {
 				zval op2;
 				ZVAL_LONG(&op2, 1);
 				if (Z_OBJ_HANDLER_P(op1, do_operation)(ZEND_ADD, op1, op1, &op2) == SUCCESS) {
 					return SUCCESS;
 				}
 			}
+			zval tmp;
+			if (Z_OBJ_HT_P(op1)->cast_object(Z_OBJ_P(op1), &tmp, _IS_NUMBER) == SUCCESS) {
+				ZEND_ASSERT(Z_TYPE(tmp) == IS_LONG || Z_TYPE(tmp) == IS_DOUBLE);
+				zval_ptr_dtor(op1);
+				ZVAL_COPY(op1, &tmp);
+				goto try_again;
+			}
 			ZEND_FALLTHROUGH;
+		}
 		case IS_RESOURCE:
 		case IS_ARRAY:
 			zend_type_error("Cannot increment %s", zend_zval_type_name(op1));
@@ -2619,15 +2627,23 @@ ZEND_API zend_result ZEND_FASTCALL decrement_function(zval *op1) /* {{{ */
 		case IS_REFERENCE:
 			op1 = Z_REFVAL_P(op1);
 			goto try_again;
-		case IS_OBJECT:
+		case IS_OBJECT: {
 			if (Z_OBJ_HANDLER_P(op1, do_operation)) {
 				zval op2;
 				ZVAL_LONG(&op2, 1);
 				if (Z_OBJ_HANDLER_P(op1, do_operation)(ZEND_SUB, op1, op1, &op2) == SUCCESS) {
 					return SUCCESS;
 				}
 			}
+			zval tmp;
+			if (Z_OBJ_HT_P(op1)->cast_object(Z_OBJ_P(op1), &tmp, _IS_NUMBER) == SUCCESS) {
+				ZEND_ASSERT(Z_TYPE(tmp) == IS_LONG || Z_TYPE(tmp) == IS_DOUBLE);
+				zval_ptr_dtor(op1);
+				ZVAL_COPY(op1, &tmp);
+				goto try_again;
+			}
 			ZEND_FALLTHROUGH;
+		}
 		case IS_RESOURCE:
 		case IS_ARRAY:
 			zend_type_error("Cannot decrement %s", zend_zval_type_name(op1));