clarify string types in pyi #84

Job	Run time
Build wheels on ${{ matrix.os }} ${{ matrix.macos_arch }}	0s
check-manifest	20s
Build source distribution	27s
Test ubuntu-latest py3.8 np==1.23.5	2m 22s
Test windows-latest py3.8 np	2m 23s
Test macos-latest py3.8 np	2m 17s
Test ubuntu-latest py3.10 np~=1.26	1m 54s
Test windows-latest py3.10 np	2m 22s
Test macos-latest py3.10 np	2m 46s
Test ubuntu-latest py3.12 np>=2.0.0b1	1m 53s
Test windows-latest py3.12 np	2m 37s
Test macos-latest py3.12 np	1m 52s
Test windows-latest py3.9 np>=2.0.0b1	2m 16s
upload_pypi	0s
	23m 29s

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