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<?php function test_hash($key): string { return (string) $key; } var_dump( test_hash(1) , test_hash(new DateTime) );
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Object of class DateTime could not be converted to string in /in/h47f7:5 Stack trace: #0 /in/h47f7(10): test_hash(Object(DateTime)) #1 {main} thrown in /in/h47f7 on line 5
Process exited with code 255.

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