tests

mypy: fix all assignment #1440

Job	Run time
collateral (diffcov)	59s
collateral (docs)	24s
test_cygwin (39, windows-latest)	8m 5s
ci_setuptools (3.10, ubuntu-latest)	4m 6s
test (3.9, ubuntu-latest)	57s
test_msvc_python_mingw	2m 27s
test (3.9, macos-latest)	1m 10s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	1m 52s
test (3.9, windows-latest)	2m 37s
test_msys2_mingw (mingw32, i686, gcc, g++)	2m 0s
test (3.13, ubuntu-latest)	53s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	1m 56s
test (3.13, macos-latest)	54s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	2m 15s
test (3.13, windows-latest)	2m 11s
test (3.10, ubuntu-latest)	1m 18s
test (3.11, ubuntu-latest)	49s
test (3.12, ubuntu-latest)	50s
test (3.14, ubuntu-latest)	3m 32s
test (pypy3.10, ubuntu-latest)	4m 34s
check	3s
release	0s
	43m 52s

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