Could you please provide an example where lc behaves different, depending on the flag?

As far as I know lc will simply preserve the flag of the input (I am not sure whether this holds on EBCDIC platforms).

The opposite function, uc, is known to set the flag for a (non-flagged) input of chr 0xFF or 'ÿ': Its uppercase equivalent 'Ÿ' is not present in ISO-8859-1, but taken from the Unicode block Latin Extended-A.

In reply to Re^3: Seeking Perl docs about how UTF8 flag propagates by haj
in thread Seeking Perl docs about how UTF8 flag propagates by raygun

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