nickva commented on PR #5698:
URL: https://github.com/apache/couchdb/pull/5698#issuecomment-3398668802
> for compatibility with what?
`_uuid` endpoint today returns hex-encoded 128 bit values as 32 byte
strings. If we switch from sequential to uuid v7 the hex-encoded format without
dashes would seem less disruptive since the shape of it would be exactly the
same as previously with the `sequential` algorithm.
> We still have the `bin` function that happens before the hex encoding. I'm
all for a place where the uuid v7 is stored as the 128 bit binary, but there
isn't one today, is there?
They are now used as the purge UUIDs in the purge id and purge seq b-trees:
```
purge_tree: UUID -> {PurgeSeq, DocId, Revs}
purge_seq_tree: PurgeSeq -> {UUID, DocId, Revs}
```
The UUID part here before was the 32 character `sequential` string as
returned from `couch_uuid:new()`, now it's the `couch_uuid:v7_bin()`.
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