utf8::all has no unimport routine, so you cannot disable it with no. Either do not use it when you do not need it, or undo its effects on filehandles:

binmode $fh, ':pop';

See PerlIO.

In reply to Re: Using pragma utf8::all in processing non-utf data. by daxim
in thread Using pragma utf8::all in processing non-utf data. by humble

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