Fix infinite loop when diffing non-equatable recursive objects #489

Job	Run time
macOS 14 (Xcode 15.4)	48s
Windows (windows-latest, debug)	1m 30s
Windows (windows-latest, release)	1m 29s
Android (Swift 6.0.2)	1m 26s
Ubuntu (5.10)	38s
Wasm	50s
	6m 41s

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