TypeScript:enums

Build 21025 on pull/12824
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Baseline History
Build 21025cba8343
Current build. There are unaccepted changes, so build 19863 is still the baseline.
Build 1879435ea083
Accepted by Michael Shilman.
Build 18039054947a
Accepted by Michael Shilman.
Build 18030b8dc809
Accepted by Dominic Nguyen.
Commenting is disabled because there's a newer build on this branch