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run code in 500+ PHP versions simultaneously
<?php print \bin2hex(\pack("d", 0.0)) . "\n"; print \bin2hex(\pack("d", -0.0)) . "\n"; print \bin2hex(\pack("d", -1.0 * 0.0)) . "\n";
Output for rfc.property-hooks, git.master, git.master_jit
0000000000000000 0000000000000080 0000000000000080

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