rust-python3: compatibility fix for incoming PyLong...
rust-python3: compatibility fix for incoming PyLong
On Python3, PyInt is PyLong and it doesn't have the
`value()` method.
Re upcasting to PythonObj as done here works, but we
might prefer taking a PythonObj from the onset
(would require more testing)
Differential Revision:
https://phab.mercurial-scm.org/D6397