On the other hand, I can't
find anything that explictly allows this.

So it's not allowed in the current text.
I agree it would be easy to add.

Do you see any
difficulty with piggybacking RFRAG-ACKs on other packets?

That would mean my proposal to compress FRACKs by simply not sending trailing zero bytes would not work.
Solution:
1) adopt another one of Pascal's recent proposals for FRACK compression (A/B/B-reverse)
2) Simply don't compress the 32-bit field in the piggy-back case.

Gruesse, Carsten

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