Unable to determine if target exists

[centromere]

>>> from pyroute2 import NDB
>>> n = NDB()
>>> list(n.sources)
['localhost', 'localhost/nsmanager']
>>> 'localhost' in n.sources
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/nix/store/6znbgb3w3r7hnld4gydqs75mib9qsm59-python3.9-pyroute2-ndb-0.6.4/lib/python3.9/site-packages/pr2modules/ndb/main.py", line 659, in __contains__
    return key in self.dump()
  File "/nix/store/6znbgb3w3r7hnld4gydqs75mib9qsm59-python3.9-pyroute2-ndb-0.6.4/lib/python3.9/site-packages/pr2modules/ndb/auth_manager.py", line 69, in guard
    return f(obj, *argv, **kwarg)
  File "/nix/store/6znbgb3w3r7hnld4gydqs75mib9qsm59-python3.9-pyroute2-ndb-0.6.4/lib/python3.9/site-packages/pr2modules/ndb/main.py", line 699, in dump
    return RecordSet(self._native(iclass.dump(self)))
TypeError: 'NoneType' object is not callable
>>> n.sources.exists('localhost')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/nix/store/6znbgb3w3r7hnld4gydqs75mib9qsm59-python3.9-pyroute2-ndb-0.6.4/lib/python3.9/site-packages/pr2modules/ndb/main.py", line 617, in exists
    key = iclass.new_spec(key, self.default_target).load_context(context).get_spec
AttributeError: type object 'Source' has no attribute 'new_spec'
>>>

As a workaround I can do 'localhost' in list(n.sources).

[svinota]

Should work now

[centromere]

Confirmed, thank you!