Overall the document is clear and mostly ready for publication.

- I suggest to add to the Terminology section a definition of "payload" and "preimage".

- "Envelope Extended Diagnostic Notation" - this is unclear as text, is it supposed to be a subsection header?

- It would be good to describe in detail the verifier's behavior (maybe an actual list of steps), including the decision on regular/detached/hashed payload.

- If content_type is not allowed, please mention that the payload is always expected to be a bstr.

- Marking the new headers as critical is only a MAY. Should it be stronger? How important is this for integrity?

- Sec. 5.1: the second half of this section is a long and convoluted sentence ("The approach...") that I find hard to parse.

- Encrypted hashes: I'm not sure if this is a real use case. But if it is, a clearer recommendation on how to use this draft in that case would be better than the current section.