Optimize even?/odd? for big integers#6314
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CRuby raises TypeError with float numbers as operands; ref #6314
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Negative integers are virtually considered as 2's compliment of the absolute value of the corresponding number. It means `-1` is considered as infinite sequence of `1` toward msb side. ref #6314
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Using mod for big integers leads to poor performance, so I replaced it with bitwise AND.