pre-funding_locked messages

[TheBlueMatt]

The current spec doesn't explicitly forbid various messages (eg HTLC add/remove) pre-funding_locked (or, at least, I dont see where it does but may be missing something) though clearly intends to. While its pretty obvious that is nonsense, it also doesn't forbid update_fee pre-funding_locked, which is not obviously nonsense, but it wouldn't be clear how to handle it as you wont see a commitment_signed/revoke_and_ack pair to lock in the update.

[t-bast]

That's true, we should probably clarify this.