Force cache eviction when instance classes don't match. #1308

Job	Run time
Pre-commit checks / Pre-commit Checks	53s
Package Rubicon-ObjC / Create Python Package	12s
Check towncrier / Towncrier Checks	26s
Unit tests (macos-13, 3.9)	58s
Unit tests (macos-13, 3.10)	46s
Unit tests (macos-13, 3.11)	50s
Unit tests (macos-13, 3.12)	45s
Unit tests (macos-13, 3.13)	1m 26s
Unit tests (macos-13, 3.14)	2m 9s
Unit tests (macos-14, 3.10)	30s
Unit tests (macos-14, 3.11)	32s
Unit tests (macos-14, 3.12)	34s
Unit tests (macos-14, 3.13)	43s
Unit tests (macos-14, 3.14)	50s
Unit tests (macos-15, 3.10)	47s
Unit tests (macos-15, 3.11)	29s
Unit tests (macos-15, 3.12)	29s
Unit tests (macos-15, 3.13)	29s
Unit tests (macos-15, 3.14)	50s
	14m 38s

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