@jekbradbury mentioned on the Forums that it would be possible to speed up packing and unpacking variable length sequences, by moving the code to C++

In my current work I find this packing really helpful, but it is also a performance bottleneck.

I'd like to ask few questions regarding this:

1. Do you know if anyone is already working on this feature?
2. If not, could anyone please advice me how I could best approach this problem, given I have some prior experience working with python C-API?
3. If I were allowed to submit it, would You be interested in a PR implementing this feature?