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<?php var_dump(sqrt(-1)); var_dump(NAN == true); var_dump(NAN === true); var_dump(NAN != NAN); var_dump(NAN !== NAN); var_dump(gettype(NAN)); var_dump(empty(NAN)); var_dump(is_null(NAN));
Output for git.master, git.master_jit, rfc.property-hooks
float(NAN) bool(true) bool(false) bool(true) bool(true) string(6) "double" bool(false) bool(false)

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