Returns timestamp of current chunk snapshot.
Store this timestamp to use in removeSnapshotUser
Adding a user to non-existent snapshot of loaded chunk is allowed,
since a ChunkLayerSnap.init is returned for such layer.
Special TimestampType.max is returned.
Returns timestamp of current chunk snapshot. Store this timestamp to use in removeSnapshotUser Adding a user to non-existent snapshot of loaded chunk is allowed, since a ChunkLayerSnap.init is returned for such layer. Special TimestampType.max is returned.