variant

The variant of the Uuid, determines the interpretation of the bits.

• 0 – special case for the Nil UUID as well as reserved for NCS
• 2 – Leach-Salz, as defined in RFC 4122 and used by this class
• 6 – reserved for Microsoft (GUID) backwards compatibility
• 7 – reserved for future extension

assertEquals(0, uuidFrom("00000000-0000-0000-0000-000000000000").variant, "Nil or NCS")
assertEquals(2, uuidFrom("00000000-0000-0000-8000-000000000000").variant, "RFC 4122")
assertEquals(6, uuidFrom("00000000-0000-0000-c000-000000000000").variant, "Microsoft")
assertEquals(7, uuidFrom("00000000-0000-0000-e000-000000000000").variant, "Future")

Return
The variant number of this Uuid.