[johnramsden]

I love python typing, and have been using it extensively in 3.6. Great to see it in the CPython core!

I've been looking forward to trying data classes, should be nice to avoid unnecessary code.

[kossae]

> The typing module is one of the heaviest and slowest modules in the standard library even with all the optimizations made.

Have you noticed any decreases in performance using core typing?

[kbd]

For those wondering, like I was, where that quote comes from, it's from PEP 560 "Core support for typing module and generic types" - https://www.python.org/dev/peps/pep-0560/