We fixed `stepManyAt` a while back without noticing it. (#775)
We fixed `stepManyAt` a while back without noticing it. (#775)

I think this is fine now.  We just don't want call `stepAt` repeatedly, like in a `foldM`.

The existing algorithm here doesn't do anything useful, since we are updating `Branch0`s which don't have history anyway.  Also we definitely want earlier actions to have priority over later ones, so I think the sorting logic might be wrong.
unisonweb/platform,unisonweb/platform,unisonweb/platform