I have a real life example in this commit: https://github.com/hpc4cmb/toast/pull/380/commits/a38d1d6dbcc97001a1ad1c315bb08cf1eecc74c7 https://github.com/hpc4cmb

I have a real life example in this commit: https://github.com/hpc4cmb/toast/pull/380/commits/a38d1d6dbcc97001a1ad1c315bb08cf1eecc74c7 https://github.com/hpc4cmb/toast/pull/380/commits/a38d1d6dbc... Replacing 2 lines of python code (with tens of glue code in Numba) with hundreds lines of C++ with glue code.