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run code in 150+ php & hhvm versions
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<?php var_dump( (float)'11111111111111111111', (float)'11111111111111111111' == (float)'11111111111111111112', (float)'11111111111111111112');
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
float(1.1111111111111E+19) bool(true) float(1.1111111111111E+19)
Output for hhvm-3.10.0

Process exited with code 153.