René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Ref leaks introduced by _io isolation (gh-101948)","articleBody":"Tried on current main.\r\n```python\r\n./python -m test -R 3:3 test_nntplib\r\n0:00:00 load avg: 2.49 Run tests sequentially\r\n0:00:00 load avg: 2.49 [1/1] test_nntplib\r\nbeginning 6 repetitions\r\n123456\r\n......\r\ntest_nntplib leaked [1222, 1220, 1222] references, sum=3664\r\ntest_nntplib leaked [828, 827, 829] memory blocks, sum=2484\r\ntest_nntplib failed (reference leak)\r\n\r\n== Tests result: FAILURE ==\r\n\r\n1 test failed:\r\n    test_nntplib\r\n\r\nTotal duration: 640 ms\r\nTests result: FAILURE\r\n```\r\nOS: WSL Ubuntu 20.04 \u0026 Windows 10\r\n\r\nUPD:\r\nLeaked tests:\r\ntest_nntplib\r\ntest_gzip\r\ntest_httpservers\r\ntest_xmlrpc\r\ntest_tarfile\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-104516\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/Eclips4","@type":"Person","name":"Eclips4"},"datePublished":"2023-05-15T16:59:59.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/104510/cpython/issues/104510"}