Misc cleanup and types updates #2569

Job	Run time
check_release	1m 49s
test_docs	51s
link_check	3m 24s
build (ubuntu-latest, 3.8)	5m 20s
Make SDist	28s
Test Lint	48s
build (ubuntu-latest, 3.12)	15m 46s
Test Minimum Versions	4m 49s
build (windows-latest, 3.8)	4m 51s
Test Prereleases	19m 33s
build (windows-latest, 3.12)	5m 59s
test_without_debugpy (ubuntu-latest, 3.9)	15m 46s
build (macos-latest, 3.8)	5m 12s
build (macos-latest, 3.12)	15m 43s
build (windows-latest, 3.9)	5m 51s
build (ubuntu-latest, pypy-3.9)	15m 43s
build (macos-latest, 3.10)	15m 51s
build (ubuntu-latest, 3.11)	15m 37s
Install from SDist and Test	18m 54s
coverage	0s
tests_check	2s
	2h 52m 17s

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