Let me repeat the question
Do you expect me to repeat the answer too? :)
If your subroutine or module specifically only handles binary strings, I'd recommend documenting it as such, and downgrading the string that you receive:
my $copy = $foo;
utf8::downgrade($copy) or utf8::encode($copy) && carp "Wide character
+in operation";
That's more or less what Perl does in its binary operators, like print.
Whatever you do, though, never assume that the absence of the flag means it's not a text string!
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