Revert 746b1cf4 "Access long value directly for call to count() in simplexml"

The count() function has a tentative return type.
Add a comment for the future.

ext/simplexml/simplexml.c

@@ -1928,8 +1928,9 @@ static zend_result sxe_count_elements(zend_object *object, zend_long *count) /*
 		zval rv;
 		zend_call_method_with_0_params(object, intern->zo.ce, &intern->fptr_count, "count", &rv);
 		if (!Z_ISUNDEF(rv)) {
-			ZEND_ASSERT(Z_TYPE(rv) == IS_LONG);
-			*count = Z_LVAL(rv);
+			/* TODO: change this to Z_LVAL_P() once the tentative type on count() is gone. */
+			*count = zval_get_long(&rv);
+			zval_ptr_dtor(&rv);
 			return SUCCESS;
 		}
 		return FAILURE;

ext/simplexml/tests/count_return_type_will_change.phpt

@@ -0,0 +1,20 @@
+--TEST--
+SimpleXMLElement::count() interaction with ReturnTypeWillChange
+--EXTENSIONS--
+simplexml
+--FILE--
+<?php
+
+class CustomClass extends SimpleXMLElement {
+    #[\ReturnTypeWillChange]
+    public function count(): string {
+        return "3";
+    }
+}
+
+$sxe = simplexml_load_string("<root/>", CustomClass::class);
+var_dump(count($sxe));
+
+?>
+--EXPECT--
+int(3)