The behavior of Enumerable#each_with_index has changed in JRuby 9.1.9.0 · Issue #4610 · jruby/jruby
Environment jruby 9.1.9.0 (2.3.3) 2017-05-15 28aa830 Java HotSpot(TM) 64-Bit Server VM 25.5-b02 on 1.8.0_05-b13 +jit [darwin-x86_64] Darwin Kernel Version 13.0.2: Sun Sep 29 19:38:57 PDT 2013; root...
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