More precise array_ unshift signature

resources/functionMap.php

@@ -318,7 +318,7 @@
 'array_uintersect_uassoc' => ['array', 'arr1'=>'array', 'arr2'=>'array', 'data_compare_func'=>'callable(mixed,mixed):int', 'key_compare_func'=>'callable(mixed,mixed):int'],
 'array_uintersect_uassoc\'1' => ['array', 'arr1'=>'array', 'arr2'=>'array', 'arr3'=>'array', 'arg4'=>'array|callable(mixed,mixed):int', 'arg5'=>'array|callable(mixed,mixed):int', '...rest='=>'array|callable(mixed,mixed):int'],
 'array_unique' => ['array', 'array'=>'array', 'flags='=>'int'],
-'array_unshift' => ['int', '&rw_stack'=>'array', 'var'=>'mixed', '...vars='=>'mixed'],
+'array_unshift' => ['positive-int', '&rw_stack'=>'array', 'var'=>'mixed', '...vars='=>'mixed'],
 'array_values' => ['array', 'input'=>'array'],
 'array_walk' => ['bool', '&rw_input'=>'array|object', 'callback'=>'callable', 'userdata='=>'mixed'],
 'array_walk_recursive' => ['bool', '&rw_input'=>'array|object', 'callback'=>'callable', 'userdata='=>'mixed'],