HTML::Entities provides _decode_entities (not HTML::Parser), so it would be more relevant to include the version of HTML::Entities.

Update: So this would be a better test case:

use HTML::Entities qw( decode_entities _decode_entities );

print(HTML::Entities->VERSION(), "\n");

# Not really, but good enough and avoids warning.
binmode(STDOUT, ':encoding(UTF-8)');

my $x = "ř";
_decode_entities($x, {});
print("$x\n");

print(decode_entities("ř"), "\n");
[download]

>c:\progs\perl580\bin\perl script.pl
1.23
ř
ř

>c:\progs\perl588\bin\perl script.pl
1.32
[some char]
[some char]
[download]

Update: Oh I see, HTML::Entities is part of HTML-Parser. Best if you just ignore this post.