Those test failures are interesting. They certainly seem related to the changes. But that doesn't explain why the tests pass for me locally or why they pass in importlib_resources. I'll continue to investigate.

Aah. The issue was that new files were added but not included in the commit (the usual foot gun aka git). I probably wouldn't have encountered that error had I been usingjj.

The remaining test is failing for unrelated reasons. Merging. Thanks for the review!

⚠️⚠️⚠️ Buildbot failure⚠️⚠️⚠️

Hi! The buildbotaarch64 Fedora Stable Clang Installed 3.x has failed when building commit5170caf.

What do you need to do:

1. Don't panic.
2. Checkthe buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/14/builds/3250) and take a look at the build logs.
4. Check if the failure is related to this commit (5170caf) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/14/builds/3250

Failed tests:

• test_importlib

Failed subtests:

• test_join_path_common_subdir - test.test_importlib.resources.test_reader.MultiplexedPathTest.test_join_path_common_subdir

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

411 tests OK.

1 test failed:
test_importlib

19 tests skipped:
test_asdl_parser test_check_c_globals test_clinic test_devpoll
test_gdb test_ioctl test_kqueue test_launcher test_msilib
test_peg_generator test_startfile test_tix test_tkinter test_ttk
test_winconsoleio test_winreg test_winsound test_wmi
test_zipfile64

1 re-run test:
test_importlib

Total duration: 2 min 36 sec

Traceback (most recent call last):  File"/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang-installed/build/target/lib/python3.12/test/test_importlib/resources/test_reader.py", line89, intest_join_path_common_subdirself.assertIsInstance(path.joinpath('subdirectory'), MultiplexedPath)AssertionError:PosixPath('/home/buildbot/buildarea/3.x.cstratak-fedora-stable-aarch64.clang-installed/build/target/lib/python3.12/test/test_importlib/resources/data01/subdirectory') is not an instance of <class 'importlib.resources.readers.MultiplexedPath'>

⚠️⚠️⚠️ Buildbot failure⚠️⚠️⚠️

Hi! The buildbots390x Fedora Clang Installed 3.x has failed when building commit5170caf.

What do you need to do:

1. Don't panic.
2. Checkthe buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/531/builds/3353) and take a look at the build logs.
4. Check if the failure is related to this commit (5170caf) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/531/builds/3353

Failed tests:

• test_importlib

Failed subtests:

• test_join_path_common_subdir - test.test_importlib.resources.test_reader.MultiplexedPathTest.test_join_path_common_subdir

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

408 tests OK.

1 test failed:
test_importlib

22 tests skipped:
test_asdl_parser test_check_c_globals test_clinic test_devpoll
test_gdb test_ioctl test_kqueue test_launcher test_msilib test_nis
test_peg_generator test_perf_profiler test_readline test_startfile
test_tix test_tkinter test_ttk test_winconsoleio test_winreg
test_winsound test_wmi test_zipfile64

1 re-run test:
test_importlib

Total duration: 3 min 53 sec

Traceback (most recent call last):  File"/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang-installed/build/target/lib/python3.12/test/test_importlib/resources/test_reader.py", line89, intest_join_path_common_subdirself.assertIsInstance(path.joinpath('subdirectory'), MultiplexedPath)AssertionError:PosixPath('/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang-installed/build/target/lib/python3.12/test/test_importlib/resources/data01/subdirectory') is not an instance of <class 'importlib.resources.readers.MultiplexedPath'>

⚠️⚠️⚠️ Buildbot failure⚠️⚠️⚠️

Hi! The buildbotAMD64 Fedora Stable Clang Installed 3.x has failed when building commit5170caf.

What do you need to do:

1. Don't panic.
2. Checkthe buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/350/builds/3193) and take a look at the build logs.
4. Check if the failure is related to this commit (5170caf) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/350/builds/3193

Failed tests:

• test_asyncio
• test_importlib

Failed subtests:

• test_subprocess_consistent_callbacks - test.test_asyncio.test_subprocess.SubprocessThreadedWatcherTests.test_subprocess_consistent_callbacks
• test_join_path_common_subdir - test.test_importlib.resources.test_reader.MultiplexedPathTest.test_join_path_common_subdir

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

411 tests OK.

1 test failed:
test_importlib

19 tests skipped:
test_asdl_parser test_check_c_globals test_clinic test_devpoll
test_gdb test_ioctl test_kqueue test_launcher test_msilib
test_peg_generator test_startfile test_tix test_tkinter test_ttk
test_winconsoleio test_winreg test_winsound test_wmi
test_zipfile64

2 re-run tests:
test_asyncio test_importlib

Total duration: 2 min 53 sec

Traceback (most recent call last):  File"/home/buildbot/buildarea/3.x.cstratak-fedora-stable-x86_64.clang-installed/build/target/lib/python3.12/test/test_asyncio/test_subprocess.py", line771, intest_subprocess_consistent_callbacksself.loop.run_until_complete(main())  File"/home/buildbot/buildarea/3.x.cstratak-fedora-stable-x86_64.clang-installed/build/target/lib/python3.12/asyncio/base_events.py", line664, inrun_until_completereturn future.result()^^^^^^^^^^^^^^^  File"/home/buildbot/buildarea/3.x.cstratak-fedora-stable-x86_64.clang-installed/build/target/lib/python3.12/test/test_asyncio/test_subprocess.py", line763, inmainself.assertEqual(events, [AssertionError:Lists differ: [('pi[69 chars]), 'process_exited', 'pipe_connection_lost', '[17 chars]ost'] != [('pi[69 chars]), 'pipe_connection_lost', 'pipe_connection_lo[17 chars]ted']Traceback (most recent call last):  File"/home/buildbot/buildarea/3.x.cstratak-fedora-stable-x86_64.clang-installed/build/target/lib/python3.12/test/test_importlib/resources/test_reader.py", line89, intest_join_path_common_subdirself.assertIsInstance(path.joinpath('subdirectory'), MultiplexedPath)AssertionError:PosixPath('/home/buildbot/buildarea/3.x.cstratak-fedora-stable-x86_64.clang-installed/build/target/lib/python3.12/test/test_importlib/resources/data01/subdirectory') is not an instance of <class 'importlib.resources.readers.MultiplexedPath'>

⚠️⚠️⚠️ Buildbot failure⚠️⚠️⚠️

Hi! The buildbotx86 Gentoo Installed with X 3.x has failed when building commit5170caf.

What do you need to do:

1. Don't panic.
2. Checkthe buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/464/builds/3848) and take a look at the build logs.
4. Check if the failure is related to this commit (5170caf) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/464/builds/3848

Failed tests:

• test_importlib

Failed subtests:

• test_join_path_common_subdir - test.test_importlib.resources.test_reader.MultiplexedPathTest.test_join_path_common_subdir

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

413 tests OK.

1 test failed:
test_importlib

17 tests skipped:
test_asdl_parser test_check_c_globals test_clinic test_devpoll
test_gdb test_ioctl test_kqueue test_launcher test_msilib
test_peg_generator test_perf_profiler test_startfile
test_winconsoleio test_winreg test_winsound test_wmi
test_zipfile64

1 re-run test:
test_importlib

Total duration: 23 min 18 sec

Traceback (most recent call last):  File"/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.12/test/test_importlib/resources/test_reader.py", line89, intest_join_path_common_subdirself.assertIsInstance(path.joinpath('subdirectory'), MultiplexedPath)AssertionError:PosixPath('/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.12/test/test_importlib/resources/data01/subdirectory') is not an instance of <class 'importlib.resources.readers.MultiplexedPath'>

I suspect the buildbot failures are due to missing directory declarations. Will investigate.