My first thoughts are that this seems like a niche use case which probably isn't worth reserving single quotes for (there's still a lot of design work around String for the future which could probably use them), and that it might be confusing that it doesn't match the Swift definition of a Character. Could this be handled with a slightly less awkward spelling that isn't as concise, like an instance method with an appropriate name? Or a macro-like # prefixed function that took a string and converted it into an array of [UInt8] or similar?
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