Unable to call .documentation() on a hug.local() interface because the doc OrderedDict is not initialized.

~/.pyenv/versions/3.8.0/lib/python3.8/site-packages/hug/interface.py in documentation(self, add_to)
    316                 for requirement in self.requires
    317             ]
--> 318         doc["outputs"] = OrderedDict()
    319         doc["outputs"]["format"] = _doc(self.outputs)
    320         doc["outputs"]["content_type"] = self.outputs.content_type

TypeError: 'type' object does not support item assignment

306         def documentation(self, add_to=None):
307             """Produces general documentation for the interface"""
308             doc = OrderedDict if add_to is None else add_to
309
310             usage = self.interface.spec.__doc__
311             if usage:
312                 doc["usage"] = usage
313             if getattr(self, "requires", None):
314                 doc["requires"] = [
315                     getattr(requirement, "__doc__", requirement.__name__)
316                     for requirement in self.requires
317                 ]
318  ->         doc["outputs"] = OrderedDict()