Bitcoin Core developer sdaftuar has proposed a new mempool design to address issues with the current mempool, which he outlined in a recent presentation. The proposed solution involves maintaining a total ordering of the mempool's transactions, which would be used to implement symmetrically opposite mining and eviction algorithms. This would make it easier to reconcile and calculate Replace-By-Fee (RBF) transactions and improve transaction selection for mining. Sdaftuar has also proposed the introduction of a limit on the size of mempool transaction clusters. A first draft implementation has already been completed, and further testing and analysis will be undertaken in the coming weeks.

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