Add support for classes #88

Job	Run time
validate-matrix-linux (ubuntu-22.04, 3.11)	13s
validate-matrix-windows (windows-2019, 3.11)	33s
validate-matrix-macos (macos-13, 3.11)	20s
validate-matrix-linux (ubuntu-22.04, 3.12)	9s
validate-matrix-windows (windows-2019, 3.12)	33s
validate-matrix-macos (macos-13, 3.12)	16s
validate-matrix-linux (ubuntu-24.04, 3.11)	12s
validate-matrix-windows (windows-2022, 3.11)	24s
validate-matrix-macos (macos-14, 3.11)	9s
validate-matrix-linux (ubuntu-24.04, 3.12)	14s
validate-matrix-windows (windows-2022, 3.12)	31s
validate-matrix-macos (macos-14, 3.12)	12s
validate-matrix-macos (macos-15, 3.11)	11s
validate-matrix-macos (macos-15, 3.12)	8s
	4m 5s

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