+ - When --timeout is specified, lulls that occur in the transfer while
+ the generator is doing work that does not generate socket traffic
+ (looking for changed files, deleting files, doing directory-time
+ touch-ups, etc.) will cause a new keep-alive packet to be sent that
+ should keep the transfer going as long as the generator continues to
+ make progress. (Requires protocol 29.)
+
+ - The stat size of a device is not added to the total file size of the
+ items in the transfer since the size might be undefined on some OSes.
+