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Possible Bitcoin Core fundRawTransaction Fee Error #887

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@lautarodragan

Flagging this so we don't forget, but I don't know whether this is/leads to an error or what it means at all. Reported by @WesleyCharlesBlake originally, who caught this log:

2018-12-10T08:20:14Z [default wallet] Fee Calculation: Fee:1989 Bytes:186 Needed:1989 Tgt:6 (requested 6) Reason:"Conservative Double Target longer horizon" Decay 0.99931: Estimation: (10401.3 - 10921.3) 95.95% 15735.7/(16397.6 0 mem 2.4 out) Fail: (9905.97 - 10401.3) 91.86% 32245.3/(35097.7 0 mem 3.4 out)

This seems to be thrown by estimateSmartFee (which is could be used under the hood by fundRawTransaction):

https://github.com/bitcoin/bitcoin/blob/234b99b9210c0a18fca10dfa75331a68f8e74a13/src/policy/fees.cpp#L882-L891

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