utf8 is a Perl-specific extension of UTF-8 capable of encoding any 72-bit value (but it's limited to encoding values the size of UVs in practice).

I didn't downvote, but it's probably because you completely fabricated a definition of the flag.

In reply to Re^5: How to set the UTF8 flag? by ikegami
in thread How to set the UTF8 flag? by dissident

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