aiohttp.client_exceptions.ClientPayloadError on feeds using chunked encoding

Comment feeds from phpBB are delivered using chunked encoding, in a way which makes aiohttp barf. Fetching via curl works:

$ curl -i https://songfight.net/forums/app.php/feed/posts
HTTP/1.1 200 OK
Date: Sun, 21 Jun 2020 07:30:08 GMT
Server: Apache
Cache-Control: private, must-revalidate
Set-Cookie: phpbb3_fhvs1_u=1; expires=Mon, 21-Jun-2021 07:30:08 GMT; path=/; domain=.songfight.net; HttpOnly
Set-Cookie: phpbb3_fhvs1_k=; expires=Mon, 21-Jun-2021 07:30:08 GMT; path=/; domain=.songfight.net; HttpOnly
Set-Cookie: phpbb3_fhvs1_sid=da219fd5cb7c6839f6f2ecaae0ce9dd7; expires=Mon, 21-Jun-2021 07:30:08 GMT; path=/; domain=.songfight.net; HttpOnly
Upgrade: h2
Connection: Upgrade
Last-Modified: Sun, 21 Jun 2020 07:21:51 GMT
Cache-Control: max-age=172800
Expires: Tue, 23 Jun 2020 07:30:08 GMT
Vary: User-Agent
Transfer-Encoding: chunked
Content-Type: application/atom+xml

<?xml version="1.0" encoding="UTF-8"?>
<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en-gb">
...

but in pushl it fails:

$ pipenv run pushl -rvvvk --rel-exclude '' https://songfight.net/forums/app.php/feed/posts
DEBUG:asyncio:Using selector: EpollSelector
DEBUG:pushl:++WAIT: https://songfight.net/forums/app.php/feed/posts: get feed
DEBUG:pushl.feeds:++WAIT: cache get feed https://songfight.net/forums/app.php/feed/posts
DEBUG:pushl.feeds:++DONE: cache get feed https://songfight.net/forums/app.php/feed/posts
DEBUG:pushl.feeds:++WAIT: request get https://songfight.net/forums/app.php/feed/posts None)
DEBUG:utils:https://songfight.net/forums/app.php/feed/posts: got error <class 'aiohttp.client_exceptions.ClientPayloadError'> Response payload is not completed (retry=0)
DEBUG:utils:https://songfight.net/forums/app.php/feed/posts: got error <class 'aiohttp.client_exceptions.ClientPayloadError'> Response payload is not completed (retry=1)
DEBUG:utils:https://songfight.net/forums/app.php/feed/posts: got error <class 'aiohttp.client_exceptions.ClientPayloadError'> Response payload is not completed (retry=2)
DEBUG:utils:https://songfight.net/forums/app.php/feed/posts: got error <class 'aiohttp.client_exceptions.ClientPayloadError'> Response payload is not completed (retry=3)
DEBUG:utils:https://songfight.net/forums/app.php/feed/posts: got error <class 'aiohttp.client_exceptions.ClientPayloadError'> Response payload is not completed (retry=4)
WARNING:utils:https://songfight.net/forums/app.php/feed/posts: Exceeded maximum retries; errors: {'Response payload is not completed'}
DEBUG:pushl.feeds:++DONE: request get https://songfight.net/forums/app.php/feed/posts
ERROR:pushl.feeds:Could not get feed https://songfight.net/forums/app.php/feed/posts: -1
DEBUG:pushl:++DONE: https://songfight.net/forums/app.php/feed/posts: get feed
INFO:pushl.main:Completed all tasks

There is probably some configuration that needs to be sent to aiohttp to make it more tolerant of chunked encoding weirdness.

Reproduce the failure with the documented pushl command against the phpBB feed, then inspect the pushl.feeds request path and utils retry logging around aiohttp. Done means the chunked feed completes successfully without ClientPayloadError and the feed can be retrieved instead of exhausting retries.