This is also true for post-processing data, like applying FFT filters. Oftentimes real world data does not have constant timestep sizes but most library functio

This is also true for post-processing data, like applying FFT filters. Oftentimes real world data does not have constant timestep sizes but most library functions for things like FFT assumed that they do. So I always resample to constant timestep size before doing anything filtering. This of course doesn't apply to real-time analysis.