`os.add_dll_directory` "The filename or extension is too long"

Steps to reproduce the problem.

pip install vickers_hardness # depends on `shapely` via `uncertainty_toolbox`

from vickers_hardness.vickers_hardness_ import VickersHardness

> [WinError 206] The filename or extension is too long: 'C:\\Users\\sterg\\Miniconda3\\envs\\crabnet\\lib\\site-packages\\Shapely.libs'
>   File "[C:\Users\sterg\miniconda3\envs\crabnet\Lib\os.py]()", line 1105, in add_dll_directory
>     cookie = nt._add_dll_directory(path)
>   File "[C:\Users\sterg\miniconda3\envs\crabnet\Lib\site-packages\shapely\__init__.py]()", line 14, in _delvewheel_init_patch_0_0_18
>     os.add_dll_directory(libs_dir)
>   File "[C:\Users\sterg\miniconda3\envs\crabnet\Lib\site-packages\shapely\__init__.py]()", line 30, in <module>
>     _delvewheel_init_patch_0_0_18()
>   File "[C:\Users\sterg\miniconda3\envs\crabnet\Lib\site-packages\uncertainty_toolbox\metrics_calibration.py]()", line 10, in <module>
>     from shapely.geometry import Polygon, LineString
>   File "[C:\Users\sterg\miniconda3\envs\crabnet\Lib\site-packages\uncertainty_toolbox\metrics.py]()", line 9, in <module>
>     from uncertainty_toolbox.metrics_calibration import (
>   File "[C:\Users\sterg\miniconda3\envs\crabnet\Lib\site-packages\uncertainty_toolbox\__init__.py]()", line 9, in <module>
>     from .metrics import (
>   File "[C:\Users\sterg\miniconda3\envs\crabnet\Lib\site-packages\vickers_hardness\vickers_hardness_.py]()", line 12, in <module>
>     import uncertainty_toolbox as uct
>   File "[C:\Users\sterg\Documents\GitHub\sparks-baird\CrabNet\crabnet\examples\extend_features_compare.py]()", line 24, in <module>
>     from vickers_hardness.vickers_hardness_ import VickersHardness

Operating system

Windows 11 Home (21H2)

Shapely version and provenance

Shapely==1.8.1.post1

Other

Related: https://stackoverflow.com/questions/10724642/windowserror-error-206-the-filename-or-extension-is-too-long-after-running

Pretty sure I have long paths enabled in Windows, and the path it mentioned doesn't seem that long.

Reproduce on Windows 11 with Shapely==1.8.1.post1 by installing vickers_hardness and importing VickersHardness from vickers_hardness.vickers_hardness_. Inspect the Shapely initialization path shown in the traceback, especially os.add_dll_directory and _delvewheel_init_patch_0_0_18. Done means the import no longer raises WinError 206 for the reported setup.