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<?php declare(strict_types=1); $foo = function (string $bar = null ) { var_dump($bar); }; $foo(); $foo(null); $foo('100'); $foo(100); $foo([100]);
Output for git.master, git.master_jit, rfc.property-hooks
NULL NULL string(3) "100" Fatal error: Uncaught TypeError: {closure}(): Argument #1 ($bar) must be of type ?string, int given, called in /in/OkYTH on line 13 and defined in /in/OkYTH:6 Stack trace: #0 /in/OkYTH(13): {closure}(100) #1 {main} thrown in /in/OkYTH on line 6
Process exited with code 255.

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