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Creates UUIDs version 1, 3, 4, and 5 in pure ruby.

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Octocat-spinner-32 README
Octocat-spinner-32 uuid.rb
I needed a uuid generator for Ruby. There's nothing wrong with current
implementations, I just wanted a simpler one, bundled in a single file (rather
than a gem), that could comply with RFC4122.

I found this charming one using Ruby Struct by Shyouhei Urabe (aka mput),
which is not online anymore (,
unfortunately. I had it in my HD, so I decided to put it back online.

All the credit really goes to mput. I just added a method to set the version
of UUID, since that was missing in the original code. I also intend to
implement version 2, which is also missing.
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