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run code in 150+ php & hhvm versions
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<?php var_dump( @serialize($f), serialize(null) );
based on cY4ba
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(2) "N;" string(2) "N;"