incorrect routing in versioned API

[janpom]

I have encountered a minor problem in request routing with versioned API.

# routing_bug.py

import hug

api = hug.http(versions=1)
api_get = api.accept('GET')


@api_get.urls("/{key}")
def get(key: hug.types.text):
    db = {'foo': 'bar'}
    if key in db:
        return {'value': db[key]}
    else:
        return {'error': '%r not found' % key}

$ hug -f routing_bug.py

$ curl -XGET http://127.0.0.1:8000/v1/foo
{"value":"bar"}
$ curl -XGET http://127.0.0.1:8000/v1/foo2
{"error":"'foo2' not found"}
$ curl -XGET http://127.0.0.1:8000/v1
{"error":"'v1' not found"}

The last is unexpected. The query gets routed to the /{key} endpoint with key="v1". However, v1 is the version, not the key. Expected behaviour is either to route to /{key} with key="" or report that the endpoint does not exist.

$ python --version
Python 3.5.4
$ pip freeze | grep hug
hug==2.4.0