exponential wait issue #526
Description
The exponential waits functions with a max value perform exponential backup followed by constant polling, exactly as designed. In my use case, I need exponential backoff up to 60 seconds followed by polling every 60 seconds forever.
The exponential wait functions compute 2^attempt_number, then return the max value (60) when 2^attempt_number exceeds 60. However, after a few days, 2^attempt_number gets very very large.
Revise the exponential wait functions to simply return max if the last returned value was max, skipping the unnecessary computation.