Krzysztof Warunek added the comment:

The case appears in asyncio's create_connection. Actually it's known thing 
https://github.com/python/cpython/blob/3.6/Lib/asyncio/base_events.py#L699, a 
workaround mentioned (same as Jim has pointed) is used widely. It seems 
reasonably at first sight to "fix it", but I consider this requirement (pass 
'') as a safety check.

----------
nosy: +kwarunek
status: pending -> open

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue27391>
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