Xmf\Uuid can be used to generate UUIDs (Universally Unique IDentifiers)
A UUID is a 128-bit number that serves as a unique identifier.
Returns a version 4 (random) UUID
Returns a packed version of the supplied UUID. The return is a 16 byte binary string, a compact form that may be more suitable for database storage.
Returns a full human readable UUID from the supplied packed form 16 byte binary string.