I do understand that the docs are a bit strange on the issue. For example, actually testing the line you referenced ("...fileno will return the same socket and not a duplicate.") by creating 2 sockets and testing sameness with the 'is' operator returns false.

I tried to trim the example code as much as possible - I did test disabling the garbage collector, playing with inheritance, etc, but trimmed them out as they didn't have any effect on my system.


I think my main issue was, when this occurs, the socket 'breaks' as you mentioned instead of closing. Was almost sure it was a bug. Using detach works for this UDP example, but I wasn't sure if detaching the socket actually closes it (e.g. in a stream oriented connection).

So this is considered normal behavior then?