Bug: fix cache and cycle ref issue #22

Job	Run time
Test Coverage (3.10, macos-latest)	11m 20s
Test Coverage (3.10, ubuntu-latest)	5m 45s
Test Coverage (3.11, windows-latest)	7m 18s
Test Coverage (3.10, windows-latest)	7m 3s
Test Coverage (3.11, macos-latest)	7m 21s
Test Coverage (3.11, ubuntu-latest)	6m 19s
Test Coverage (3.12, macos-latest)	7m 56s
Test Coverage (3.12, ubuntu-latest)	7m 29s
Test Coverage (3.12, windows-latest)	6m 17s
Test Coverage (3.8, macos-latest)	5m 23s
Test Coverage (3.8, ubuntu-latest)	5m 19s
Test Coverage (3.8, windows-latest)	6m 7s
Test Coverage (3.9, macos-latest)	5m 34s
Test Coverage (3.9, ubuntu-latest)	5m 3s
Test Coverage (3.9, windows-latest)	6m 17s
	1h 40m 31s

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