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my $content = do {
    if (is_filehandle $f) { local $/ = <$f> }
    elsif (-f $f)         { local(@ARGV, $/) = $f; <> }
    else                  { LWP::UserAgent->new->get($f)->decoded_cont
+ent }
};

my $content = do
{
...
        LWP::UserAgent->new->get($f)->decoded_content;
    }
};