ufechner@TUD277255:~/repos/julia$ git checkout cf1226e55d033336f109ae0ffc06058e2f050d65
fatal: reference is not a tree: cf1226e55d033336f109ae0ffc06058e2f050d65
ufechner@TUD277255:~/repos/julia$
ufechner@TUD277255:~/repos/julia$ git checkout ib/time_include_topleveloverhead
error: pathspec 'ib/time_include_topleveloverhead' did not match any file(s) known to git.
ufechner@TUD277255:~/repos/julia$
I also really enjoy the GitHub CLI for things like this. That lets you just write gh pr checkout 39779 to checkout the PR with the number 39779 in the upstream repo.