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Consider a case with Qset { N: 6, Threshold: 4}, 6 nodes and a threshold of 4.

If a Node has received 4 commit confirmed messages for a ballot b then it is safe to act on it - as an example by applying a transaction set to its ledger.

However if the additional 2 nodes sent their confirmation late, then the Node will reject these messages in its validation routine (validateValue in SCPDriver), because the transaction set will now consist entirely of double-spend transactions.

Is it normal or desired for a Node to reject the additional messages after it has externalized a ballot? How does Stellar handle this? Surely the extra messages beyond the threshold are still useful - for example for archival nodes?

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