Squash to only one “proper” commit for github pull request

Question

I have a repo on github which someone else (Bob, for the sake of argument) has issued a pull request for. His code\'s not perfect, so we go through a few rounds of markups.

Answer 1

Note that Bob doesn't have to squash his commits when he is making a GitHub PR.
Since March 2016, you can leave that operation to the maintainer (you) accepting your PR.

See "Squash your commits" and its new documentation

This is a new option which lets you force commit squashing on all pull requests merged via the merge button.