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<?php var_dump(array(-42 => 1, "-37" => 2));
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [-42]=> int(1) [-37]=> int(2) }
Output for 4.3.0 - 4.3.2
array(2) { [-42]=> int(1) ["-37"]=> int(2) }