Anders Hejlsberg 2f0d07c29a
Increase selectivity of subtype relationship for signatures (#35659)
* Increase selectivity of subtype relationship for signatures

* Add regression test

* Accept new baselines

* Use strictSubtypeRelation for union subtype reduction

* (x: number | undefined) -> void is subtype of (x?: number | undefined) => void

* Accept new baselines

* Add tests

* Accept new baselines

* Address CR feedback

* Fix parameter list length check

* Accept API baseline changes
2019-12-20 14:52:22 -08:00
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