rate: Avoid precision loss with edge cases #1
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When burst is 1, there would be edge cases we get tokens of 0.9999999999997222 due to float64 multiplication/division rounding out value. So avoid those calculation when 'last' is old enough Fixes golang/go#46579
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When burst is 1, there would be edge cases we get tokens of 0.9999999999997222
due to float64 multiplication/division rounding out value. So avoid those
calculation when 'last' is old enough
Fixes golang/go#46579