Match a named argument for a negative position in the native getArgByPositionOrName()

The PHP method still finds an argument passed by name when the position is
negative; the C++ mirror returned null early. Comparing the hash key as
zend_ulong keeps exact parity with $i === $position.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: 2 people

turbo-ext/src/ArgumentsNormalizer.cpp

@@ -881,7 +881,7 @@ PT_MINIT_REGISTRATION(pt_register_arguments_normalizer)
 			Z_PARAM_LONG(position)
 			Z_PARAM_STR(name)
 		ZEND_PARSE_PARAMETERS_END();
-		zend_object *arg = position < 0 ? NULL : phpstanturbo::visitors::argForParameter(args, (zend_ulong) position, ZSTR_VAL(name), ZSTR_LEN(name));
+		zend_object *arg = phpstanturbo::visitors::argForParameter(args, (zend_ulong) position, ZSTR_VAL(name), ZSTR_LEN(name));
 		if (arg == NULL) RETURN_NULL();
 		RETURN_OBJ_COPY(arg);
 	});