Support arbitrary unicode codepoint #29

Currently, the following code is invalid.

#lang brag
graphic: "\x21".."\x7E" # "!".."~"
utf8: "\u0080".."\uFFFF"

What's the behavior of brag when handling unicode strings? Racket's documentation says a string is a list of codepoints.

Currently, the following code is invalid. ``` #lang brag graphic: "\x21".."\x7E" # "!".."~" utf8: "\u0080".."\uFFFF" ``` What's the behavior of brag when handling unicode strings? [Racket's documentation](https://docs.racket-lang.org/guide/characters.html) says a string is a list of codepoints.

I can look into it. The .. character-range operator is part of neither Racket nor brag, however.

I can look into it. The `..` character-range operator is part of neither Racket nor brag, however.

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Support arbitrary unicode codepoint #29