clarify string types in pyi #88

Job	Run time
Build wheels on ${{ matrix.os }} ${{ matrix.macos_arch }}	0s
Build source distribution	27s
check-manifest	23s
Test ubuntu-latest py3.8 np==1.23.5	1m 52s
Test windows-latest py3.8 np	2m 13s
Test macos-latest py3.8 np	2m 7s
Test ubuntu-latest py3.10 np~=1.26	1m 54s
Test windows-latest py3.10 np	3m 6s
Test macos-latest py3.10 np	4m 2s
Test ubuntu-latest py3.12 np>=2.0.0b1	2m 43s
Test windows-latest py3.12 np	2m 19s
Test macos-latest py3.12 np	5m 47s
Test windows-latest py3.9 np>=2.0.0b1	3m 16s
upload_pypi	0s
	30m 9s

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