inconsistent callables

[codemasher]

https://wiki.php.net/rfc/consistent_callables

function foo(callable $callable){
  // ...
}

foo('trim'); // -> Argument 1 passed to foo() must be callable, string given

foo([$obj, 'method']); // -> Argument 1 passed to foo() must be callable, array given

Both cases work fine on PHP 7.2/Windows, but break on linux.