WIP: Compatibility with EmPy 4 #542

Job	Run time
pytest / setup	5s
bootstrap / setup	3s
bootstrap / bootstrap (macos-latest, 3.8)	56s
bootstrap / bootstrap (macos-latest, 3.9)	40s
bootstrap / bootstrap (macos-latest, 3.10)	41s
bootstrap / bootstrap (macos-latest, 3.11)	40s
bootstrap / bootstrap (macos-latest, 3.12)	42s
bootstrap / bootstrap (ubuntu-latest, 3.8)	57s
bootstrap / bootstrap (ubuntu-latest, 3.9)	54s
bootstrap / bootstrap (ubuntu-latest, 3.10)	55s
bootstrap / bootstrap (ubuntu-latest, 3.11)	53s
bootstrap / bootstrap (ubuntu-latest, 3.12)	57s
bootstrap / bootstrap (windows-latest, 3.8)	43s
bootstrap / bootstrap (windows-latest, 3.9)	42s
bootstrap / bootstrap (windows-latest, 3.10)	43s
bootstrap / bootstrap (windows-latest, 3.11)	43s
bootstrap / bootstrap (windows-latest, 3.12)	45s
bootstrap / bootstrap (ubuntu-20.04, 3.6)	53s
pytest / pytest (macos-latest, 3.8)	1m 19s
pytest / pytest (macos-latest, 3.9)	1m 7s
pytest / pytest (macos-latest, 3.10)	53s
pytest / pytest (macos-latest, 3.11)	52s
pytest / pytest (macos-latest, 3.12)	56s
pytest / pytest (ubuntu-latest, 3.8)	3m 21s
pytest / pytest (ubuntu-latest, 3.9)	7m 32s
pytest / pytest (ubuntu-latest, 3.10)	1m 47s
pytest / pytest (ubuntu-latest, 3.11)	3m 19s
pytest / pytest (ubuntu-latest, 3.12)	3m 4s
pytest / pytest (windows-latest, 3.8)	2m 9s
pytest / pytest (windows-latest, 3.9)	2m 29s
pytest / pytest (windows-latest, 3.10)	2m 21s
pytest / pytest (windows-latest, 3.11)	2m 14s
pytest / pytest (windows-latest, 3.12)	2m 5s
pytest / pytest (ubuntu-20.04, 3.6)	1m 5s
	49m 25s

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