Nathan Shively-Sanders 4189b4d718 Narrowing type parameter intersects w/narrowed types ...

This makes sure that a union type that includes a type parameter is
still usable as the actual type that the type guard narrows to.

2016-08-02 16:10:20 -07:00

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reference

Narrowing type parameter intersects w/narrowed types

2016-08-02 16:10:20 -07:00