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run code in 200+ php & hhvm versions
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<?php var_dump(sprintf('%.20f', -9.341+2.111));
based on 3QPXU
Output for 5.6.0 - 5.6.38, hhvm-3.15.4, 7.0.0 - 7.3.0
string(23) "-7.22999999999999864997"