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        // key is in [] because otherwise openscad will search for each letter rather than the string.

        index = search([key], dict, 1, 0)[0]

    // There must be a key match or a default value

    ) assert (index!=[] || !is_undef(default), "Key lookup failed, key not found!")

    ) assert (index!=[] || !is_undef(default), "Key lookup failed, key not found and no default given!")

      // return value from the dict if key matches, else return a default value.

      index!=[] ? dict[index][1] : default;