[willvarfar]

And instead of behind-the-scenes lazily creating the range, so you have a generator that reifies when its modified and has a nice __str__ etc they go make incompatible changes; got it! ;)

I know rather too much about how CPython and other VMs work under the hood and am in no mood to try and save the day any more. I still use python, but the latest stuff around MyPy and async io just make me despair frankly. I think rust+go will probably pick up a lot of people who used to care deeply about python. So it is.