code: def protected_branches():
      # type: () -> list[str]
      
      master = conf.get('git.master_branch', 'master')
      develop = conf.get('git.devel_branch', 'develop')
      return conf.get('git.protected_branches', (master, develop))
docs: Return branches protected by deletion.
  
      By default those are master and devel branches as configured in pelconf.
  
      Returns:
          list[str]: Names of important branches that should not be deleted.