Add support for classes #96

Job	Run time
validate-matrix-linux (ubuntu-22.04, 3.11)	13s
validate-matrix-macos (macos-13, 3.11)	21s
validate-matrix-linux (ubuntu-22.04, 3.12)	11s
validate-matrix-windows (windows-2019, 3.11)	25s
validate-matrix-macos (macos-13, 3.12)	23s
validate-matrix-linux (ubuntu-24.04, 3.11)	11s
validate-matrix-windows (windows-2019, 3.12)	30s
validate-matrix-macos (macos-14, 3.11)	11s
validate-matrix-linux (ubuntu-24.04, 3.12)	12s
validate-matrix-windows (windows-2022, 3.11)	29s
validate-matrix-macos (macos-14, 3.12)	11s
validate-matrix-windows (windows-2022, 3.12)	21s
validate-matrix-macos (macos-15, 3.11)	11s
validate-matrix-macos (macos-15, 3.12)	9s
	3m 58s

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