TypeScript:unions

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Baseline History
Build 19540d7dd658 current baseline
Current build. Accepted by Norbert de Langen.
Build 19535c055a69
Ancestor build. There were unaccepted changes, so this was not used as a baseline.
Build 19503f883f08
Accepted by Norbert de Langen.
Build 1879435ea083
Accepted by Michael Shilman.
Build 18039054947a
Accepted by Michael Shilman.
Build 18030b8dc809
Accepted by Dominic Nguyen.
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