it is a bad way to do code reviews after pull request has been initiated. sometimes we want to do code reviews before the whole thing is ready for integration. is there any tools out there that will allow code review without pull request? I prefer cloud based solution such as reviewable but it only works with pull request...
Fastforward to 2019. Github now offers "draft pull requests":
https://github.blog/2019-02-14-introducing-draft-pull-requests/