Exponential Backoff instead of "cowardly limit" of 8 stacked PRs?

[bdaz]

Love ghstack, but frequently running into Cowardly refusing to handle a stack with more than eight PRs. You are likely to get rate limited by GitHub if you try to create or manipulate this many PRs. You can bypass this throttle using --force

Force obviously works—until you are in fact rate limited (and then all hell breaks loose and neither ghstack nor myself have any idea what state things are in).

Seems like a typical case for using exponential backoff if we're getting 429s from GitHub's API. Consider this a feature request!

[ezyang]

I took the opportunity read the GitHub docs more carefully and I saw this: https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api?apiVersion=2022-11-28#exceeding-the-rate-limit

So actually we know exactly how long we should wait before we try again. Seems like a simple patch to add. Maybe send a PR?