Hi,

To mark the mid-GSoC evaluations, I'm happy to release another
core.typed version.

Highlights:

- type checking speed enhancements
- some usages of `every?` now update local types as expected
  - currently works best on things exactly of type IPersistentCollection
(aka. a new alias Coll)

eg. cast a (Coll Any) to (Coll Number):
  (cf (let [a (ann-form [] (Coll Any))]
         (assert (every? number? a))
         a))
  ;=> (Coll Number)

- combining keys/vals with every? updates an IPersistentMap type as you
would expect

eg. cast a (IPM Any Any) to (IPM Number Any)
(cf (let [a (ann-form {} (IPersistentMap Any Any))]
       (assert (every? number? (keys a)))
       a))
;=> (IPersistentMap Number Any

- New `Extends` type constructor can say which interfaces a type does *not*
extend (helps fix some unsoundness)

Thanks,
Ambrose

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