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<?php $undef; $nothing = $undef; var_dump($nothing); debug_zval_dump('undef');
Output for git.master, rfc.property-hooks
Warning: Undefined variable $undef in /in/R8DMh on line 4 NULL string(5) "undef" interned
Output for git.master_jit
Warning: Undefined variable $undef in /in/R8DMh on line 4 NULL string(5) "undef" refcount(2)

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