Fix infinite recursion in IsType<T> #498

Job	Run time
windows-x64 (x64, debug, windows)	5m 30s
windows-arm64 (arm64, release, windows)	6m 1s
windows-x64 (x64, release, windows)	5m 33s
linux-arm64 (arm64, debug, ubuntu)	3m 19s
windows-arm64 (arm64, debug, windows)	6m 8s
linux-arm64 (arm64, release, ubuntu)	3m 22s
linux-x64 (x64, debug, ubuntu)	3m 43s
macos-arm64 (arm64, release, macos)	3m 47s
linux-x64 (x64, release, ubuntu)	3m 32s
macos-arm64 (arm64, debug, macos)	4m 59s
sign-nuget	0s
publish-nightlies-github	0s
publish-nightlies-azure	0s
	45m 54s

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