Retry a request with backoff

A request that fails once will often succeed on the next try. Exponential backoff prevents hammering struggling APIs.

Implement retry(task, { attempts, baseDelay }). Retry on rejection until attempts run out, doubling the delay each time.

What it has to do

• Resolve as soon as any attempt succeeds.
• Reject with the last error once attempts are exhausted.
• Double the delay after each failure, starting at baseDelay.

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