python3 utf8 characters in url get mangled

Using python3
The following client built using requests

import requests
import urllib

if __name__ == '__main__':
    s = requests.Session()
    url = 'http://localhost:4040/' + urllib.parse.quote("Ω")
    print(url)
    r = s.get(url)
    print(r)
    print('What we expect:')
    print('Ω == Ω')
    print('What we got:')
    print(r.content.decode('utf8'))

When run against the following server:

import web

class allofit:
   def GET(self, arg1):
       	if (arg1 != 'Ω'):
           return 'Ω != '+arg1
        return 'Ω == '+arg1+' YAY!'

urls = ('/([^/]+)', 'allofit',)

app = web.application(urls, globals(), autoreload=True)

if __name__ == '__main__':
    app.run()

Produces:

http://localhost:4040/%E2%84%A6
<Response [200]>
What we expect:
Ω == Ω
What we got:
Ω != â
      ¦

Notice that the % escaped utf8 character is not preserved. Bug?