current in refusing to delete the current branch should be default

[jsoref]

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Bug

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Steps:

$ git push test :prerelease 
To https://github.com/check-spelling-sandbox/crispy-octo-dollop.git
 ! [remote rejected] prerelease (refusing to delete the current branch: refs/heads/prerelease)
error: failed to push some refs to 'https://github.com/check-spelling-sandbox/crispy-octo-dollop.git'

There's no concept of current branch in github: https://docs.github.com/en/search?search-overlay-input=%22current+branch%22&search-overlay-ask-ai=true&query=%22current+branch%22

https://docs.github.com/en/repositories/working-with-files/managing-files/deleting-files-in-a-repository

Below the commit message fields, decide whether to add your commit to the current branch or to a new branch. If your current branch is the default branch, you should choose to create a new branch for your commit and then create a pull request. For more information, see Creating a pull request.

As it happens, my current branch (locally) is main:

$ git branch
* main

Note the presence of default but not current in: https://github.com/check-spelling-sandbox/crispy-octo-dollop/branches

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