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A comment on A Cross-Platform String Library Written in Swift. Parent comment

Re:A Cross-Platform String Library Written in Swift by TazeTSchnitzel on Monday March 06, 2017 @04:17AM (#13801577)
None. But letters can be neither lowercase nor uppercase.
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Re:A Cross-Platform String Library Written in Swift by setr on Monday March 20, 2017 @02:21AM (#13912159)
In which case, the function(s) should really be throwing some kind of error, since they can't reasonably be applied to the input.

But checking !(isUppercase(str) || isLowercase(str)) to see if its not case-able(?) is absurd

Obviously you'd instead want the function notCaseable(str).

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