Cherry-pick #46645 to release-4.5#46649

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DanielRosenwasser merged 1 commit intomicrosoft:release-4.5from

andrewbranch:pick-56f81075f9

Nov 3, 2021

Commits on Nov 2, 2021

Properly check whether union type contains only primitive types (#46645)

ahejlsberg
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andrewbranch
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