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When storing a snapshot `snap`, if `snap.idx > e.idx` where `e` is the last entry in the log (if any), we need to clear all previous entries so that we don't create a gap in the log. The log must remain contiguous. One case is controversial: what to do if `snap.idx == e.idx + 1`. Technically no gap would be created between the entry and the snapshot. However, if we now want to store a new entry with index `e.idx + 2`, that would create a gap between two entries which is illegal.