I’m wondering why the String.CharacterView structure has a reserveCapacity(:) member? And even more strangely, why String itself has the same method?
It’s even weirder that String.UnicodeScalarView has this method, but it reserves `n` `UInt8`s of storage, instead of `n` `UInt32`s of storage. Also why String.UTF8View and String.UTF16View do not have this method, when it would make more sense for them to have it than for String itself and String.CharacterView to have it.
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