[qwerty456127]

Why would this matter (except when you build an index for a big database)?

Note:

> 6.8. Opacity: UUIDs SHOULD be treated as opaque values and implementations SHOULD NOT examine the bits in a UUID to whatever extent is possible.

[legulere]

When you translate between UUIDs in binary and in text form and communicate with other code the binary UUIDs. The other code might expect the uuids in a different encoding.