GROOVY-4018: Make the Groovy truth value of NaN be false #409
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Just thought I'd take a stab at implementing this, maybe there are performance concerns with this. It may be more efficient to use
FLOAD/DLOADbefore theisNaNcall instead of theDUP2up front, but in the context of those methods I wasn't sure how to access the index of the variable on the stack.