Fix NAN propagation through interval and / or opcodes #245
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[NaN, NaN]does not mean "this interval is guaranteed to be NaN"; instead it means "this interval may have any value". As such, we can't short-circuit when doing interval evaluation ofAndandOropcodes. ANaNin either argument must bepropagated, and we must set the
Choice::Bothflag.Fixes #240 (for real this time)