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A prefix tree to store the paths of all config files and to search the nearest config
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Returns the closest config relative to filename by doing a depth
first search on the prefix tree.
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When finding files that can be imported, it is important for the cases to match because while
file os.path.exists("module.py") and os.path.exists("MODULE.py") both return True on Windows,
Python can only import using the case of the real file.
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