[throw0101a]

> Among other changes 10.4 adds post-quantum keys (composite ML-DSA 44 and Ed25519), not enabled by default.

The draft was only published a few months ago:

* https://datatracker.ietf.org/doc/draft-miller-sshm-mldsa44-e...

The draft is a 'personal document', so not associated with the IETF/WG.