[synparb]

I'll echo @dagw's comments. Cython has been rock solid for me for a long time and it is my go to for any sort of external c/c++ library interfacing. That said, I find myself using Numba more and more in the places that I can as Numba has gotten significantly better in the last 6 months or so. It's still not a complete replacement for cython (and I don't think it ever will or intends to be), but for hot spot numerical calculations it's really nice since it's much faster to test things out since it doesn't involve the boiler plate required by Cython, and doesn't require the (often slow) compilation times.

In Numba 0.21.0, on-disk caching of jit'd code was also introduced, which was one of the major sticking points for us to put Numba into production in areas where we needed faster start-up times. Before we could really only use Cython because we required the start-up times available only from AOT compilation.

That all said, Numba has been a bit buggy for me at times, although these get squashed pretty quickly. I've only found a single bug in Cython in all of the years I've been using it, and it's amazing how quickly Robert Bradshaw or Stefan Behnel respond and fix things considering Cython is not their full time job.