ConCache.dirty_update_existing

You're seeing just the function dirty_update_existing, go back to ConCache module for more information.
Link to this function

dirty_update_existing(cache_id, key, update_fun)

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Specs

dirty_update_existing(t(), key(), update_fun()) ::
  :ok | {:error, :not_existing} | {:error, any()}

Dirty equivalent of update_existing/3.