def config
      return @config if @config

      @config = read_spell_config(GLOBAL_SPELL_CONFIG_FILE)
      custom_config = read_spell_config(CUSTOM_SPELL_CONFIG_FILE)

      report_duplicates(config["dictionary"], custom_config["dictionary"].to_a)

      custom_config["dictionary"] = @config["dictionary"] + custom_config["dictionary"].to_a
      custom_config["dictionary"].uniq!

      # override the global values by the local if present
      @config.merge!(custom_config)

      @config
    end
def config
      return @config if @config

      @config = read_spell_config(GLOBAL_SPELL_CONFIG_FILE)
      custom_config = read_spell_config(CUSTOM_SPELL_CONFIG_FILE)

      report_duplicates(config["dictionary"], custom_config["dictionary"].to_a)

      custom_config["dictionary"] = @config["dictionary"] + custom_config["dictionary"].to_a
      custom_config["dictionary"].uniq!

      # override the global values by the local if present
      @config.merge!(custom_config)

      @config
    end
return the merged global and the custom spell configs
 @return [Hash] the merged configuration to use