Not having heard anything to the contrary by the deadline, I pushed my patch as
479b791bf828f8d105b334fe04ff82a4adfedcd7
--
Karl Williamson
---
via perlbug: queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=131760
[perl #131760] "Wide character" errors are undocumented
by Karl Williamson via RT