feat: Adding `class of` to all current classes #9

Job	Run time
Build and/or Test (ubuntu-latest, stable)	59s
Build and/or Test (ubuntu-latest, 2.2.0)	2m 59s
Build and/or Test (ubuntu-latest, 2.0.12)	1m 25s
Build and/or Test (windows-latest, stable)	1m 15s
Build and/or Test (windows-latest, 2.2.0)	1m 27s
Build and/or Test (windows-latest, 2.0.12)	1m 15s
Build and/or Test (macos-latest, stable)	1m 38s
Build and/or Test (macos-latest, 2.2.0)	5m 29s
Build and/or Test (macos-latest, 2.0.12)	6m 1s
Package and create GitHub Release	0s
	22m 28s

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