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The only impactful change is that by default on regtest and testnet the
fallbackfee
(used when there is not enough historical data to correctly estimate the feerate) is now set to 0, whereas it was set to 0.0002 btc in previous versions. This change only impacts regtest and testnet, on mainnet this parameter has always been set to 0.We set it manually in tests
bitcoin.conf
to preserve the past behavior (as recommended by bitcoind's release notes).