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- I think there's a consensus that this is not a large enough space to be used as a reasonable hash value, so the only real use case is ICQ. (JO--
)what does "ICQ" mean?
-JO
ICQ is an ancient chat program that identified users by a large integer. See http://en.wikipedia.org/wiki/ICQ#UIN . -Diego
System-allocated 64-bit keys with reuse
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