Well, I’ve just uploaded the last of my copyedited stuff for the book. With a bit of luck – if they don’t throw it back at me – that’s this phase done. They now do “composition”, after which my final task is to review their proofs.
Apart from any remaining glitches, the main issue now is how they’ll deal with things like line breaks in code examples. Those changed during the copyedit, for reasons that probably don’t matter. I’ve put notes in one or two places, but for the most part I can’t really do better than to bear in mind that these people publish lots of computing books, and must know about laying out code!