Commits on Feb 19, 2021

1. Add a type-checking fast path for primitive types …

   When `Draft<T>` is applied to a large enum type, TypeScript has to do a
   lot of unnecessary structural comparisons to confirm that no element of
   the enum matches `Function`, `Date`, `RegExp`, etc.  Determining that
   they do match `string` or `number`, on the other hand, is trivial.  This
   change splits `PrimitiveType` out of `AtomicObject` so that the fast
   path can be checked first.
   
   In microsoft/TypeScript#42824, this cut the
   check time from ~2.5 seconds to ~0.3 seconds.

   

   amcasey committed Feb 19, 2021
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