There are a number of deprecated functions and arguments for binning/histogramming. We did not set a removal date. But since it has been 2 years, I think we are good to remove them.

In src/core/binning.py.

• Remove deprecated arg in rebin
• Remove histogram function

In src/core/bins.py:

• GroupbyBins.concat; it looks like we can remove GroupbyBins entirely.