Encoding: compare with case insensitive UTF-8 to avoid using iconv when not necessary #6355
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We have
IO#set_encoding
which accepts an encoding. If it's UTF-8 there's nothing to do, because IO is assumed to be UTF-8 by default (regarding text). The current comparison is case sensitive, but in some cases the encoding can come with other cases (like in #6353). So to avoid using iconv, which should be slower then just doing it in Crystal (and also a bit redundant), I added a case insensitive comparison.Update: includes tests.