Resolution: issue 2 proposal accepted.
No objections in above discussion, and positive opinions (👍) from a few implementors on the proposal. Proposal text incorporated into spec and reviewed.
Proposal implementation in mf2py parser, test cases provided, and Brid.gy verification that mf2py implementation satisfies use-case for the issue is sufficient to demonstrate implementability and utility, all as noted/linked in issue thread.
Edited specification accordingly. Thanks everyone for all the hard work on this one! Took a while but I think it was worth it to get it just right.