SE-0243: Codepoint and Character Literals

[taylorswift]

@lorentey

For Turing’s sake! Why would you ever do that? Just add your own property to UTF8View to extract an UInt32 from a four-byte ASCII sequence. You can go as wild as you like — go ahead and reinterpret the contents of the underlying contiguous buffer, if that’s what you want.

So far into the bowels of String we must go,, and I thought the goal here was to make bytestrings easier.