This has been fixed in blead by
6cdc5cd8f36f88172b0fcefdcadec75f5b6600b2
--
Karl Williamson
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via perlbug: queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=126310
[perl #126310] no "Malformed UTF-8 character" warning onsingle-quoted strings under "use utf8"
by Karl Williamson via RT