Solana’s SIMD-0649 proposal closed without merging on Sept. 25, 2026, after reviewers sought more discussion and acknowledgements from client developers. Authored by Max Resnick, Lead Economist at Anza, the draft would have made non-vote transactions invalid when recorded out of descending priority order within an entry batch. Priority would have been calculated as the leader’s reward multiplied by 1,000,000 and divided by requested compute cost plus one. Leaders would still have controlled transaction inclusion, batch boundaries and deferrals, so the rule would not have created slot-wide ordering or prevented self-preference, MEV or sandwich attacks. Non-final batches would have had to span at least two FEC sets, or 64 data shreds, although reviewers questioned whether leaders could still use batch boundaries to bypass the intended ranking. The proposal also raised replay-latency concerns for Firedancer and lacked data supporting the batch-size threshold. The discussion continues in GitHub Discussion #605, and a revised proposal could be resubmitted after additional client-team support.