future strings do not work with urllib.urlencode

[st-pasha]

In Python 2.7.12 the following snippet throws an exception (KeyError: 47) in standard library urllib:

from future.types import newstr as str
import urllib
urllib.urlencode({"a": str("/foo")}, doseq=True)

This might be a bug with urllib itself, since the exception only appears with the doseq parameter. However I was wondering whether this is something you might be able to fix.

[c4milo]

Any update on this?