[Twisted-Python] DeferredList.addDeferred behaviour

[RITA Y/O RODRIGO DIAZ Y/O BENENSON]

I have been playing with DeferredList if found that his behaviour was not what I expected,

>>> dfl = DeferredList([])
>>> print dfl.called
True
>>> dfl.addDeferred(d)
>>> d.called
0
>>> print dfl.called
True

The workaround it to first create the list of deferred instance and then instanciate with it the DeferredList. But what sense does have the addDeferred method then ? I this behaviour what is supposed to be ?

rodrigob.