Numerous minor changes for correctness.

[robertlipe]

• Zillions of tiny edits to remove a warning or improve correctness.
• Prep for push
• Fix typo in a symbol that should be deleted...

Description

Contributing requirements

• [x] I read the contribution guidelines in CONTRIBUTING.md.
• [x] I understand the BlinkenPerBit metric, and maximized it in this PR.
• [x] I selected main as the target branch.
• [x] All code herein is subjected to the license terms in COPYING.txt.