URL types

[brunns]

I like to use yarl for storing and manipulating URLs. The requests library used to let me use these directly, but httpx does not:

import yarl, requests, httpx
url = yarl.URL("https://brunn.ing")
r1 = requests.get(url)
r2 = httpx.get(url)
Traceback (most recent call last):
  File "/Applications/PyCharm CE.app/Contents/plugins/python-ce/helpers/pydev/pydevconsole.py", line 364, in runcode
    coro = func()
  File "<input>", line 1, in <module>
  File "/Users/brunns/dev/brunns/mbtest/.tox/py39/lib/python3.9/site-packages/httpx/_api.py", line 195, in get
    return request(
  File "/Users/brunns/dev/brunns/mbtest/.tox/py39/lib/python3.9/site-packages/httpx/_api.py", line 109, in request
    return client.request(
  File "/Users/brunns/dev/brunns/mbtest/.tox/py39/lib/python3.9/site-packages/httpx/_client.py", line 812, in request
    request = self.build_request(
  File "/Users/brunns/dev/brunns/mbtest/.tox/py39/lib/python3.9/site-packages/httpx/_client.py", line 366, in build_request
    url = self._merge_url(url)
  File "/Users/brunns/dev/brunns/mbtest/.tox/py39/lib/python3.9/site-packages/httpx/_client.py", line 396, in _merge_url
    merge_url = URL(url)
  File "/Users/brunns/dev/brunns/mbtest/.tox/py39/lib/python3.9/site-packages/httpx/_urls.py", line 121, in __init__
    raise TypeError(
TypeError: Invalid type for url.  Expected str or httpx.URL, got <class 'yarl.URL'>: URL('https://brunn.ing')

I'm moving a largish codebase over from requests to httpx, and having to wrap my URLs in str(url) in many places is painful, and I'm not sure it should be necessary.

(I used to use furl rather than yarl- the same issue exists with that.)