RateLimitExceededException not raised when rate limit exceeds via making many PRs

When the rate limit is exceeded using by making too many PRs, the RateLimitExceededException is not raised, instead it is a GithubException. I would expect that it would be the rate limit exception, given it's a 403 and gives the rate limit exceeded exception:

403 {"documentation_url": "https://docs.github.com/en/free-pro-team@latest/rest/overview/resources-in-the-rest-api#secondary-rate-limits", "message": "You have exceeded a secondary rate limit. Please wait a few minutes before you try again."}

Example code:

def create_branch(repo, branch_name):
    sb = repo.get_branch(repo.default_branch)
    repo.create_git_ref(ref='refs/heads/' + branch_name, sha=sb.commit.sha)

def exceed():
    for i in range(100):
        repo = g.get_repo("mhoeger/test")
        branch = f"mhoeger/test-branch-{time.time()}"
        create_branch(repo, branch)
        repo.create_file("test.txt", "TEST!", "hi", branch)
        repo.create_pull("testing", "test", repo.default_branch, branch)

まず、ブランチ、ファイル、プルリクエストを繰り返し作成する例を使って、secondary-rate-limit のレスポンスを再現します。GitHub API クライアントがこの 403 レスポンスをどのように処理するかを追跡し、RateLimitExceededException の処理と比較します。ドキュメントに記載された secondary-rate-limit のレスポンスが GithubException ではなく RateLimitExceededException を発生させ、その動作をテストでカバーできれば完了です。