Currently coinview does not account for spent coins in the mempool,
This does not create problems because we have additional checks in
right places which detect double spends, but technically
coinview should help you detect double spent in the mempool as well.
This way it will be compatible with chain.getCoinView.
getSpentView will still return all outputs that are available
in the mempool. (This could also return spentView from indexers if
available, this method is used by `signrawtransaction`.)
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