BallotBox中是否可以维护每个Peer的matchIndex而不是给每个Log维护一个Ballot以提高commit性能？

在BallotBox中只维护每个Peer的matchIndex（每个peer已经commit的Index）。在CommitAt中推高matchIndex，并根据matchIndex判断Majority的commitIndex最小值。

这样是否会比给每个Log维护一个Ballot有显著的Commit性能提升？

Start by reading the BallotBox CommitAt path and its handling of per-log Ballot values. Compare that behavior with maintaining each peer's matchIndex and deriving the majority commitIndex from the minimum applicable value. Done means a decided design supported by commit-performance measurements and confirmation that commit behavior remains correct.

Written by the indexing model from the issue text.