Port TS#62656: Fix TS2783 false positive for union types in object sp… #9369

Job	Run time
smoke	6m 44s
format	1m 43s
build	3m 55s
tidy	1m 26s
extension	38s
misc	1m 18s
lint (noembed)	5m 43s
lint (windows-latest)	15m 9s
generate	10m 35s
test (noembed)	9m 28s
test (ubuntu-latest)	11m 3s
test (race mode)	17m 51s
test (no submodules)	7m 40s
test (macos-latest)	12m 50s
test (concurrent test programs)	10m 46s
lint (ubuntu-latest)	5m 32s
test (windows-latest)	20m 30s
required	4s
	2h 22m 55s

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