Re-throwing exception in Ice for C#

There are many cases in the Ice for C# source code where exceptions are re-thrown using this syntax:

catch (SomeException ex) {
  throw ex;
}

whereas the usual syntax would be:

catch (SomeException ex) {
  throw;
}

The difference is that in the first version, the existing stack trace is thrown away and the point of re-throwing is considered the new origin of the exception.

Is this intentional (why?), or just an artifact of porting from Java, where this difference does not exist (AFAIK)?

Karl