Assorted MyPy improvments (#1663) #1256

Job	Run time
Build wheel and source distribution	14s
Binary aarch64-unknown-linux-gnu (ubuntu-22.04)	1m 54s
Publish to PyPI	0s
Binary x86_64-unknown-linux-gnu (ubuntu-22.04)	1m 48s
Binary x86_64-unknown-linux-musl (ubuntu-22.04)	2m 9s
Binary powerpc64le-unknown-linux-gnu (ubuntu-22.04)	1m 49s
Binary x86_64-pc-windows-msvc (windows-2022)	4m 0s
Binary i686-pc-windows-msvc (windows-2022)	4m 11s
Binary aarch64-apple-darwin (macos-12)	2m 13s
Binary x86_64-apple-darwin (macos-12)	2m 20s
Build release distributions	0s
Build Windows installers	39s
Build macOS installer and sign/notarize artifacts	51s
Build development distributions / Ensure Hatch is installable	11s
Build development distributions / Distribution x86_64-unknown-linux-gnu	56s
Build development distributions / Distribution x86_64-pc-windows-msvc	53s
Build development distributions / Distribution aarch64-unknown-linux-gnu	2m 24s
Build development distributions / Distribution aarch64-apple-darwin	23s
Build development distributions / Distribution x86_64-apple-darwin	39s
Publish distributions	0s
	27m 34s

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