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Fix deletion of empty directories:
1. When comparing the directory to delete against the top level cache_path, use File.realpath to make sure we aren't comparing two unequal strings that point to the same path. This occurs, for example, when cache_path has a trailing slash, which it does in the default Rails configuration. Since the input to delete_empty_directories never has a trailing slash, the comparison will never be true and the top level cache directory (and above) may be deleted. However… 2. File.delete raises EPERM when trying to delete a directory, so no directories have ever been deleted. Changing the code to Dir.delete fixes that.
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