TypeScript:optionals

Build 21102 on pull/12824
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BaselineBuild 18988 on pull/12515
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Build 211029168b45
Current build. There are unaccepted changes, so build 18988 is still the baseline.
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Build 18039054947a
Accepted by Michael Shilman.
Build 18030b8dc809
Accepted by Dominic Nguyen.
Build 1791674b9764
Accepted by Michael Shilman.
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