FFTLogx provides a python wrapper around the C code, but reuses old python APIs. It makes the python code much faster than the older pure python version.
This version contains additional forms of integrals.
(1) Bessel squared
(2) a form that is shown in weak lensing - used in LSST-DESC N5K (Non-Limber method) Challenge.
Notes.pdf is also updated to describe the new derivations.