I think HTML::TreeBuilder only works on bytes (not characters) since it's made to work on files. I had problems getting it to work with characters and ended up decoding everything I extracted from the tree. The way to go might be
my $html_file = encode(
'ASCII',
$response->decoded_content(),
Encode::FB_HTMLCREF
);
my $tree = HTML::TreeBuilder->new();
$tree->parse($html_file);
and use utf8::decode on everything extracted from the tree if necessary.
It has the advantage of handling multiple byte encoding if HTML::Parser doesn't, and one knows which encoding to use when decoding data extracted from the tree.
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