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)

Comienza reproduciendo la respuesta de secondary-rate-limit con el ejemplo que crea ramas, archivos y pull requests repetidamente. Rastrea cómo el cliente de la API de GitHub maneja esta respuesta 403 y compáralo con el manejo de RateLimitExceededException. La tarea estará terminada cuando la respuesta documentada de secondary-rate-limit lance RateLimitExceededException en lugar de GithubException, con pruebas que cubran este comportamiento.