[majewsky]

I find force pushes acceptable for topic branches of public repos. In fact, I use them a lot to leave behind clean history. Same as with squash merges, which technically also lose history.

[prodigal_erik]

It's better to push a similar name and let people decide if and when to rebase --onto the new upstream.

Squash merges are just bad. They destroy all the info that makes git handle branching and conflicts better than svn.