Introduction to core.typed

Let's have a look at another mind blowing library: core.typed, that brings a gradient type system to Clojure (and soon ClojureScript)!

Lots of interesting stuff in there, let's try to type-annotate all the things!

Also, the floor is open to anyone interested in presenting something as usual.

IMPORTANT: This meetup will be held at the HiQ headquarters, not at PugglePay's! I know, we're breaking a long streak of hosted meetups, but change is good! :)