No, that first snippet in the OP is not trying to convert Unicode U263A to Latin-1; the wide-character warning is simply telling you that you have a string that perl is treating as utf8 data, and it's being printed to a file handle that has not been set up for that.

This isn't quite true. AFAICT the wide-character warning is only given when printing a string that can't be converted to Latin1 on a filehandle that doesn't have an encoding specified. If it can be converted to Latin1, it is, and there is no warning. If not, the utf8 encoding is output. (Filehandles with encoding specified will give a warning like "\x{0391}" does not map to iso-8859-15. and output (in this case) the literal 8 characters "\x{0391}".)

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