I used \hfull\break to work around an Overfull issue - what should I have used?

Also, shouldn't make-unsigned-like be introduced and explained somewhere? It first appears out of the blue in [range.prim.size]p1.3 (same for make-unsigned-like-t).

They're introduced in P1522R1.

Most of your uses of \placeholder in this change are similar to the uses where you changed to \placeholdernc. Did you make up your mind what looks better? Then, please be consistent.

I changed all added \placeholder{}s with \placeholdernc{}s to make you happy, but the surrounding Latex is inconsistent in its use of \placeholder v. \placeholdernc. We need to come up with some rules on which to use where, and do a global sweep to fix it.

Leave this unresolved so we'll know to create an issue for it.

Most of your uses of \placeholder in this change are similar to the uses where you changed to \placeholdernc. Did you make up your mind what looks better? Then, please be consistent.

I changed all added \placeholder{}s with \placeholdernc{}s to make you happy, but the surrounding Latex is inconsistent in its use of \placeholder v. \placeholdernc. We need to come up with some rules on which to use where, and do a global sweep to fix it.

Please don't blindly change \placeholder to \placeholdernc. The latter is a surgical tool for fixing cases of bad kerning due to italics corrections, and should be used sparingly only where there is actual bad kerning. Usually the italics correction is what we want; the bounding box for italicized text is wider due to the right overhang, and it so we want to create a little extra space.

I've found that \placeholdernc improves the presentation immediately before a period or a comma (where there is no higher text for the italics to get uncomfortably close to). So let's take that as rough guidance for now: use \placeholdernc before a teletype period or comma, where there would otherwise be an unsightly amount of horizontal space.

Looking through a few more examples, \placeholdernc before a left paren also seems more pleasant to my eye, but before a left angle bracket I prefer including the italic correction.

Most of your uses of \placeholder in this change are similar to the uses where you changed to \placeholdernc. Did you make up your mind what looks better? Then, please be consistent.

I changed all added \placeholder{}s with \placeholdernc{}s to make you happy, but the surrounding Latex is inconsistent in its use of \placeholder v. \placeholdernc. We need to come up with some rules on which to use where, and do a global sweep to fix it.

Leave this unresolved so we'll know to create an issue for it.

opened #3135

Looking through a few more examples, \placeholdernc before a left paren also seems more pleasant to my eye, but before a left angle bracket I prefer including the italic correction.

All the \placeholder{}s added in this motion occur before left parens, so it appears that the changes from \placeholder -> \placeholdernc in the Fixups are correct.