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I just read Roberto's slides from the 2012 Lua workshop, and I have a
suggestion for the UTF-8 library.

It is efficient, and often practical, to deal with byte indices, even
in Unicode strings. It is the approach taken by Julia, and I use it in
LuLPeg. The API is simple:

    char, next_pos = getchar(subject, position)

    S = "∂ƒ"
    getchar(S, 1) --> '∂', 4
    getchar(S, 4) --> 'ƒ', 6
    getchar(S, 6) --> nil, nil

A similar function could return code points instead of strings.

What do you think about this?

-- Pierre-Yves