class RuboCop::ResultCache

def initialize(file, options, config_store, cache_root = nil)

collisions.
Include the user name in the path as a simple means of avoiding write 
def initialize(file, options, config_store, cache_root = nil)
  cache_root ||= ResultCache.cache_root(config_store)
  @path = File.join(cache_root, rubocop_checksum, RUBY_VERSION,
                    relevant_options(options),
                    file_checksum(file, config_store))
end