Wrong base class for transport returned by loop.create_datagram_endpoint()

[asvetlov]

BPO	46194
Nosy	@asvetlov, @1st1, @carlosdamazio, @carlosdamazio
PRs	bpo-46194: Make selector inherit asyncio.DatagramTransport #30291

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-12-29.14:56:23.713>
labels = ['3.11', '3.8', '3.9', '3.10', 'expert-asyncio']
title = 'Wrong base class for transport returned by loop.create_datagram_endpoint()'
updated_at = <Date 2021-12-29.20:44:28.023>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2021-12-29.20:44:28.023>
actor = 'carlosdamazio'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['asyncio']
creation = <Date 2021-12-29.14:56:23.713>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 46194
keywords = ['patch']
message_count = 2.0
messages = ['409309', '409326']
nosy_count = 4.0
nosy_names = ['asvetlov', 'yselivanov', 'dmzz', 'carlosdamazio']
pr_nums = ['30291']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue46194'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10', 'Python 3.11']

[asvetlov]

Selector-based event loops returns _SelectorDatagramTransport which inherits asyncio.Transport instead of asyncio.DatagramTransport.

isinstance(transp, asyncio.DatagramTransport) fails.
It doesn't affect the actual execution since transp.sendto() and transp.error_received() are correctly implemented.

The bug doesn't affect Windows proactor-based implementation.

The fix is relatively easy, a champion is welcome!

[carlosdamazio]

I think I have a fix for this, I opened a PR. Let me know if you have any questions.