Add proper benchmarking functionality to .dev/compare_branches.R #778
Description
I think properly benchmarking the two branches is in scope for the script but would require a much bigger PR... filed this quickly as a first pass to give a rough idea (I don't expect it to work for, say, <30% performance difference, but something like 2x/3x should show up)
Originally posted by @MichaelChirico in #777 (comment)