Accept a generator of ints as an input

[pombredanne]

We should be able to accept a generator of ints as an input and not only a list.

This is not correct:

>>> from intbitset import *
>>> intbitset([1,2,3])
intbitset([1, 2, 3])
>>> intbitset(iter([1,2,3]))
intbitset([])
>>> def a(seq):
...    yield from seq
... 
>>> intbitset(a([1,2,3]))
intbitset([])

See aboutcode-org/scancode-toolkit#3077 reported by progval

[HeWeMel]

I ran into this. Ok, the docs say "rhs ... sequence". But they also say "Emulates the Python built-in set class interface".

Thanks for the package. This comment is just to inform you. No pressure.