It lets me edit the pull request, but the edit only seems to allow choosing between different branches on my own repository. I've tried accepting the request and starting again, but it looks like I can only generate one pull request for a given commit. So far, the only way I've found to get my patch through is by making a small edit (like a white space edit), generating a new branch with that edit, and generating an entirely new pull request.
The usual way to deal with this is:
I think this should work for you as well.
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