> Given the recent multiple additions of "forgotten things" in the ABI,
> wouldn't it be better to mark the ABI experimental so that things can
> get ironed out in 3.2.1? (especially with user feedback after the
> release)

I don't know what would be gained in such a marking, or how the marking
could be carried out.

I assume that uptake of the ABI is slow either way (marked or not),
although you might manage to slow it down further by marking it
experimental. I can't see why that would be desirable.