Get bounding box of selection excluding handles

[oneweioranother]

I realised I’ve asked this before!

Set transform origin to centre of selection

I tried to make this script then realised it’s harder than it seems! Is there a way to return the selected path but with extrema added, without changing the actual outlines… to calculate the correct bounding box (i.e. ignore the off-curve handles, but still include the path at bounding box when there is no extrema)?