Change:
KD0 and ND0 to allow for out-of-order delivery, and SHOULD retain D2 to allow for processing future messages. <del> 12.4. </del> <ins> 12.3. </ins> During each epoch senders MUST NOT encrypt more data than permitted by the security bounds of the AEAD scheme used.

Discussion:
The current draft uses a hash ratchet to derive single-use keys for application messages, but for handshake messages, re-uses the same key with a sequence of different nonces. This results in a lot of unnecessary extra code. This PR uses the same hash ratchet for handshake and application messages. The only difference is in the base key for the hash ratchet. In the application case, we use the AStree. In the HS case, we derive the base keys directly from the handshake secret. The lack of a tree in the HS case means that either the client will do a linear number of derivations on the first send/receive, or it will keep the handshake secret around and not get FS for handshake messages within the epoch.
NAME - would appreciate your thoughts here
As discussed on the PR call: There's no point to FS for Proposals because clients have to cache the plaintext anyway Given that, the "flat derivation" approach should be fine We should have separate keys per sender to it easier to avoid nonce collisions Unclear whether we should derive nonces on a hash ratchet or use a counter
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Please merge when you have chance.