Describe the feature or problem you’d like to solve

The CLI clutters my local repo with branches from past invocations of gh pr.

For example, imagine working on a project with a pull request #123 which corresponds to a branch named add-some-feature. Running gh pr checkout 123 will add a branch named add-some-feature to the local repo. When the branch is changed to something else (say, master), the add-some-feature branch will remain.

These can add up over time.

Proposed solution

I would like if gh pr checked out the changes in a detached HEAD state. That way, when the branch is changed to something else (again, say, master) no branch would be left behind.