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<?php $foo = [new stdClass()]; var_dump(array_fill_keys($foo, 'b'));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Object of class stdClass could not be converted to string in /in/gBHIk:4 Stack trace: #0 /in/gBHIk(4): array_fill_keys(Array, 'b') #1 {main} thrown in /in/gBHIk on line 4
Process exited with code 255.

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