It doesn't to me seem entirely implausible that a module that can convert escaped, latin-1 characters into unicode could also manage the reverse process. It's a fairly reasonable thing to want to do, after all.
Incidentally, I did try looking at XML::Writer
(which I'd assume is one of the many), and it didn't seem to have a method to do this either.
As it happened, I ended up using Unicode::String
and a regex ( 's|([\200-\377])|sprintf("&#%i;", ord($1))|ge
' ), which works, afaict.
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