Add type information to member variable #122

Job	Run time
Build distribution packages	13s
Cross-arch tests with nox (arm64, ubuntu-20.04, 3.11, pytest_min)	4m 0s
Test with nox (ubuntu-20.04, 3.11, ci_checks_max)	1m 15s
Test documentation website generation	0s
Cross-arch tests with nox (arm64, ubuntu-20.04, 3.11, pytest_max)	3m 46s
Test with nox (ubuntu-20.04, 3.11, pytest_min)	51s
Test package installation in different architectures	2m 50s
Test with nox	1s
Cross-arch tests with nox	1s
Publish documentation website to GitHub pages	0s
Create GitHub release	0s
Publish packages to PyPI	0s
	12m 57s

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