Fix Bugs in NSCalendar Date Calculations #44
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I ran into a couple of crashers when writing tests for NSCalendar date calculations, and this PR is designed to address them.
The first crasher was in initializing an NSCalendar instance. It was attempting to compare the calendar identifiers to the kCF*Calendar constants, but that was getting routed through NSObject#isEqual, which prevented it from matching up the calendar identifiers. I was able to address this by adding an implementation of isEqual for NSString, but I don't know if this implementation is sufficient or correct, so any feedback on that would be welcome.
The second crasher was in _CFCalendarDecomposeAbsoluteTimeV, getting the value for the "leap month" component. The mapping for that component had not been defined yet.