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<?php var_dump(unserialize('a:2:{i:0;i:10000000000000000;i:1;R:2;}'));
Output for 4.3.11 - 4.4.9, 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> &int(10000000000000000) [1]=> &int(10000000000000000) }
Output for 4.3.0 - 4.3.10, 5.0.0 - 5.0.3
array(2) { [0]=> &int(1874919424) [1]=> &int(1874919424) }