Does it matter? You can use true, TRUE, YES and yes, can't you?
Besides, saying something is 'true' makes more sense in a sentence describing the effect of some function, rather than 'yes'.
a BOOL used to be YES or NO for the last quarter of a century
It's still YES or NO.
If I'm writing ObjC I use YES/NO. If I'm writing Swift I use true/false. I think it's personal preference at this point.
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Developer Tools & Services
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