Hello,

I am using hash table to know if a URL has already been seen, but I don't
care about functions like "each" or "keys": I just want to know if a given
URL is already in it, that's all. I don't want to store all those urls in
full text!

So I am using md5 digest to compress the URL, like "return 0 if
$seen{md5($url)};"

This results in a smaller Hash in memory, but using a hash algorithm on a
hash is quite irritating...

Do you know any other way, or Tie class, to do this in a smarter and more
efficient way?

Thanks in advance,
Thomas

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