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Fix ExpiringCache.__len__ to be accurate #3956
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It used to try and produce an estimate, which was sometimes negative. This caused metrics to be sad, so lets always just calculate it from scratch. (This appears to have been a longstanding bug, but one which has been made more of a problem by #3932 and #3933). (This was originally done by Erik as part of #3933. I'm cherry-picking it because really it's a fix in its own right)
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It used to try and produce an estimate, which was sometimes negative. This caused metrics to be sad, so lets always just calculate it from scratch.
(This appears to have been a longstanding bug, but one which has been made more of a problem by #3932 and #3933).
(This was originally done by Erik as part of #3933. I'm cherry-picking it because really it's a fix in its own right)