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HistoryPurgeLevel Enumeration

SymbolValueDescription
HistoryPurgeTail0All phantom operations (or operation tail) are dropped and removed.
HistoryPurgeBranches1All branches except the current one are dropped and removed.
HistoryPurgeAllButCurrent2All operations in a history are deleted. The document state is NOT changed, all modifications are “merged” into the single operation, which becomes an operation list root.
HistoryPurgeAll3Remove all operations except the very first one.