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run code in 200+ php & hhvm versions
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<?php var_dump(json_encode(['1.234', '234.324324'], JSON_NUMERIC_CHECK));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
string(18) "[1.234,234.324324]"