Assorted MyPy improvments #1253

Job	Run time
Build wheel and source distribution	15s
Binary aarch64-unknown-linux-gnu (ubuntu-22.04)	1m 51s
Binary x86_64-unknown-linux-gnu (ubuntu-22.04)	1m 52s
Binary x86_64-unknown-linux-musl (ubuntu-22.04)	2m 7s
Publish to PyPI	0s
Binary powerpc64le-unknown-linux-gnu (ubuntu-22.04)	1m 57s
Binary x86_64-pc-windows-msvc (windows-2022)	3m 18s
Binary i686-pc-windows-msvc (windows-2022)	3m 25s
Binary aarch64-apple-darwin (macos-12)	3m 5s
Binary x86_64-apple-darwin (macos-12)	2m 31s
Build release distributions	0s
Build Windows installers	0s
Build macOS installer and sign/notarize artifacts	0s
Build development distributions / Ensure Hatch is installable	12s
Publish distributions	0s
Build development distributions / Distribution x86_64-pc-windows-msvc	55s
Build development distributions / Distribution aarch64-apple-darwin	22s
Build development distributions / Distribution x86_64-unknown-linux-gnu	57s
Build development distributions / Distribution x86_64-apple-darwin	41s
Build development distributions / Distribution aarch64-unknown-linux-gnu	2m 31s
	25m 59s

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