fix: workaround broken asyncio.staggered on python < 3.8.2

.github/workflows/ci-cd.yml

@@ -36,15 +36,19 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
+          - "3.8.0"
           - "3.8"
           - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
         os:
-          - ubuntu-latest
+          - ubuntu-20.04
           - windows-latest
           - macOS-latest
+        exclude:
+          - os: macOS-latest
+            python-version: "3.8.0"
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4

src/aiohappyeyeballs/impl.py

@@ -5,11 +5,23 @@
 import functools
 import itertools
 import socket
+import sys
 from asyncio import staggered
 from typing import List, Optional, Sequence
 
 from .types import AddrInfoType
 
+if sys.version_info < (3, 8, 2):  # noqa: UP036
+    # asyncio.staggered is broken in Python 3.8.0 and 3.8.1
+    # so it must be patched:
+    # https://github.com/aio-libs/aiohttp/issues/8556
+    # https://bugs.python.org/issue39129
+    # https://github.com/python/cpython/pull/17693
+    import asyncio
+    import asyncio.futures
+
+    asyncio.futures.TimeoutError = asyncio.TimeoutError  # type: ignore[attr-defined]
+
 
 async def start_connection(
     addr_infos: Sequence[AddrInfoType],