Yes, this is the first feature I've seen that makes me think about what it would take to move my team over from 2.x. We have a moderate codebase (around 70k lin

Yes, this is the first feature I've seen that makes me think about what it would take to move my team over from 2.x. We have a moderate codebase (around 70k lines, last I checked) and are getting to the point where we'd probably get some benefit from types and a type-checking IDE or tool.