So, does Perl assume by default, even in a UTF-8 environment, that it should output everything in Latin-1 ?
Perl tries to not convert anything at all, automatically.
And since Latin-1 (mostly?) maps the first 256 codepoints 1:1 to bytes, outputting something without any conversion is the same as outputting it as Latin-1.
Note that this round-trips binary data, which means that if your scripts or input use UTF-8, and you don't use utf8;, the output will be UTF-8 again.
But, Latin-1 is limited to codepoints up to 255, so if something higher than that shows up in your string, perl falls back to UTF-8 (and warns).
(As always, I'm linking to Encodings and Unicode in Perl, in the hope that it's useful to you).
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