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On Wed, Dec 9, 2015 at 9:29 PM, Jay Carlson <> wrote:
> Given a string where is_utf8(s) is false, it might be nice to be able to find the byte offset of the first non-UTF-8 sequence.

utf8.len() already does this. On an invalid sequence, it returns two
values: nil plus the byte position of the first invalid sequence. I
believe this was also mentioned earlier in the thread.