Why does code contain

tr///;
[download]

? :-)

update: Perhaps the reason is just that, to cause B::Deparse to not work. We now have a defense against those killjoy deobfuscator sorts who would arm themseleves with nothing but B::Deparse in the war against obfuscated code. And it's really quite stealthy too:

y;;;
y yyy
y,,,
tr,,,
tr sss
[download]

Well, you get the idea.