Good question. The only solution I was able to think of uses the "dup" of the handles and a callback. You can add the & prototype to save yourself from typing (sub ) every time.
#!/usr/bin/perl
use warnings;
use strict;
use feature 'say';
sub encoding {
my $code = shift;
open my $STORE_STDOUT, '>&STDOUT' or die $!;
binmode STDOUT, 'encoding(UTF-8)';
$code->();
open STDOUT, '>&', $STORE_STDOUT or die $!;
}
my $utf8 = "\x{3bc}\x{1fc6}\x{3bd}\x{3b9}\x{3bd}";
say 'A:', $utf8;
encoding(sub {
# Here, no warning is issued.
say 'B:', $utf8;
}); # End of scope, STDOUT is no longer affected.
say 'C:', $utf8;
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