26.8: I wonder if we could keep the foo, fool, foof overloads together on the same page. Not a big deal, though, and I don't think we should do this for C++20.

32.5.4.4.2: The widowed class-head is unfortunate. But I think we can live with this if a newpage here causes problems. (Similar in 32.5.5.3, but I think that'd be too much to add a newpage before if fixing 32.5.4.4.2 doesn't affect it.)

32.9.10.2/17: I think we should move the "Error conditions:" line onto the next page with its bullets.

Other than that, Clause 25-32 look good. Thanks!

I've addressed the [thread.] stuff. Regrettably, there was quite a bit of fall-out; needs re-review. Force-pushed.