refactor: faster iteration #267

Job	Run time
test on ubuntu	1m 16s
test on macos	1m 42s
coverage	1m 29s
test on windows	3m 38s
test 3.7	45s
test 3.8	39s
test 3.9	37s
test 3.10	37s
build sdist	18s
test 3.11	36s
test 3.12	50s
test pypy3.7	1m 13s
test pypy3.8	1m 20s
test pypy3.9	52s
test pypy3.10	3m 28s
build on ${{ matrix.os }} (${{ matrix.target }} - ${{ matrix.interpreter \|\| 'all' }}${{ (((matrix.os == 'linux') && format(' - {0}', (((matrix.manylinux == 'auto') && 'manylinux') \|\| matrix.manylinux))) \|\| '') }})	0s
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
test build on ${{ matrix.os }}	0s
inspect-pypi-assets	0s
check	2s
release	0s
	19m 22s

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