why commit a instance on fast-path that requires all replicas to be reply equal in preAcceptReply

hi, guys:

Why do need all the replies inst. Lb. AllEqual in the preAcceptReply reply to go commit on the fast-path , the following code is implemented:

1050 if inst.lb.preAcceptOKs >= r.N/2 && inst.lb.allEqual && allCommitted && isInitialBallot(inst.ballot) {

1112 if inst.lb.preAcceptOKs >= r.N/2 && inst.lb.allEqual && allCommitted && isInitialBallot(inst.ballot) {

In the paper, only the fast-quorum of replies with the same instance, then committing on fast-path

Is there anything else I haven't considered?

Thanks

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