If a node had received (2 * f + 1) ready's (with matching root hash) from distinct nodes, it knows that at least (f + 1) good nodes have sent it. Hence every good node will eventually receive (f + 1) and broadcast ready itself. Eventually a node with (2 * f + 1) readys and (f + 1) echos will decode
(senderID uint64, req *ReadyRequest)
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