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<?php class Foo { function __sleep() { return ['lookMaIDoNotExist']; } } var_dump(serialize(new Foo));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: serialize(): "lookMaIDoNotExist" returned as member variable from __sleep() but does not exist in /in/h5OM8 on line 8 string(14) "O:3:"Foo":0:{}"

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