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<?php $foo = function (int $bar = null ) { var_dump($bar); }; $foo(); $foo(null); $foo(100); $foo('100'); $foo([100]);
Output for git.master, git.master_jit, rfc.property-hooks
NULL NULL int(100) int(100) Fatal error: Uncaught TypeError: {closure}(): Argument #1 ($bar) must be of type ?int, array given, called in /in/IopBV on line 10 and defined in /in/IopBV:2 Stack trace: #0 /in/IopBV(10): {closure}(Array) #1 {main} thrown in /in/IopBV on line 2
Process exited with code 255.

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