aiohttp.CookieJar.filter_cookies does not accept string parameter

[melkamar]

Long story short

Documentation states that it should be possible to filter cookies using URL as a plain string. However, that raises an exception:

filtered = session.cookie_jar.filter_cookies('http://httpbin.org')

Expected behaviour

It should be possible to filter cookies by plain string.

Actual behaviour

Using plain string causes an exception.

Steps to reproduce

Follow example in documentation.

[fafhrd91]

merged

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