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Entries may be added or removed from `sys.meta_path` concurrently. For example, setuptools temporarily adds and removes the `distutils` finder from the beginning of the list. The local copy ensures that we don't skip over any entries. Some packages modify `sys.modules` during import. For example, `collections` inserts the entry for `collections.abc` into `sys.modules` during import. We need to ensure that we re-check `sys.modules` *after* the parent module is fully initialized.