> On May 24, 2016, at 12:49 PM, Jens Alfke <[email protected]> wrote: > > >> On May 24, 2016, at 11:03 AM, Tony Parker <[email protected] >> <mailto:[email protected]>> wrote: >> >> Why not use `func boolValue` instead, if you need a true/false answer? > > I don’t remember the original code snippet, but there are cases where you > need to know what type of number is stored in an NSNumber. An example is > encoding to JSON, where a boolean value should be written as “true” or > “false”, not “1” or “0”. > > —Jens
Fair enough, and we do use this trick in NSJSONSerialization(.m). One other possibility is using the objCType property on NSNumber’s superclass NSValue to check. I haven’t seen how much of this is implemented in corelibs-foundation yet. We did redefine Boolean to _Bool in Swift CF, so we’ll have to see if that accidentally resulted in a runtime difference between platforms here that we didn’t consider. - Tony
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