Stricter tests for serializations #1992

Job	Run time
Check code formatting with ruff and mypy + tests (3.8)	39s
Check Readme is not outdated (3.8)	25s
Test and lint (ubuntu-latest, 3.8)	3m 16s
Test and lint (ubuntu-latest, 3.9)	5m 15s
Test and lint (ubuntu-latest, 3.10)	5m 5s
Test and lint (ubuntu-latest, 3.11)	5m 15s
Test and lint (ubuntu-latest, 3.12)	5m 46s
Test and lint (windows-latest, 3.8)	6m 7s
Test and lint (windows-latest, 3.9)	8m 50s
Test and lint (windows-latest, 3.10)	7m 36s
Test and lint (windows-latest, 3.11)	8m 56s
Test and lint (windows-latest, 3.12)	7m 51s
Test and lint (macos-latest, 3.8)	4m 10s
Test and lint (macos-latest, 3.9)	6m 58s
Test and lint (macos-latest, 3.10)	6m 42s
Test and lint (macos-latest, 3.11)	10m 32s
Test and lint (macos-latest, 3.12)	10m 21s
	1h 43m 44s

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