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<?php $f = function (X&Y $foo = null) {}; $r = new ReflectionParameter($f, 0); var_dump($r->getType()->allowsNull());
Output for git.master, git.master_jit
Deprecated: {closure:/in/aURFN:3}(): Implicitly marking parameter $foo as nullable is deprecated, the explicit nullable type must be used instead in /in/aURFN on line 3 bool(true)

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