ActiveSupport::Cache::FileStore#file_path_key does not work if initialized with Pathname #2209
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When you initialize ActiveSupport::Cache::FileStore with a Pathname instance (e.g., Rails.root.join('tmp', 'cache')), #file_path_key does not work correctly--it expects cache_path to be a String, so cache_path.size is the length of the path. When cache_path is a Pathname, cache_path.size is the size of the referenced file or directory on disk.
This appears to have been introduced on 2010-04-27 by commit ee51b51.
See also: