sync.rb difference between Sync::UN, Sync::EX and Sync::SH

[Trans]

In sync.rb what are Sync::UN, Sync::EX and Sync::SH all about?

Thanks,
T.

 

[Trans]

Oh, one other thing. SyncEnumerator has nothing to do with Sync right?
Maybe it would be better if were named something else (TandemEnumerator
come to mind).

Thanks,
T.

 

[Trans]

No one know? I assume Sync::EX when underlying data is gogin to change
and Sync::SH when it's not? Can EX just be used alwasy instead?

T.