Add experimental support for "diffable" objects #409

Job	Run time
macOS 12 (Xcode 13.3.1)	15m 41s
Ubuntu (5.5)	53s
macOS 12 (Xcode 13.4.1)	12m 32s
SwiftWasm	53s
Ubuntu (5.6)	55s
macOS 13 (Xcode 14.3.1)	11m 19s
macOS 12 (Xcode 14.0.1)	12m 26s
Ubuntu (5.7)	47s
macOS 12 (Xcode 14.1)	12m 44s
Windows (windows-latest, debug)	3m 20s
Ubuntu (5.8)	51s
Windows (windows-latest, release)	2m 15s
	1h 14m 36s

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