streadway/simpleuuid — pull request #2 by tsenart (2013-03-21 09:45:00+00:00)
Title: NewTimeWithMD5Salt

This change set makes it possible to integrate identity in the UUID based on time plus computed hash of some salt.
This is useful in a distributed systems scenario where your identifiers are TimeUUIDs.
Replacing the jitter with a deterministic byte string makes retrying the computation (in case of failure or partial failure) idempotent.