class Github::Client::GitData::References

def list(*args)
  arguments(args, required: [:user, :repo])
  params = arguments.params
  user = arguments.user
  repo = arguments.repo
  response = if (ref = params.delete('ref'))
    validate_reference ref
    get_request("/repos/#{user}/#{repo}/git/refs/#{ref}", params)
  else
    get_request("/repos/#{user}/#{repo}/git/refs", params)
  end
  return response unless block_given?
  response.each { |el| yield el }
end