public final <U3> Tuple8<T1, T2, U3, T4, T5, T6, T7, T8> map3(Function<? super T3, ? extends U3> function) {
        return Tuple.tuple(v1, v2, function.apply(v3), v4, v5, v6, v7, v8);
    }
Apply attribute 3 as argument to a function and return a new tuple with the substituted argument.
jOOL-java-8/src/main/java/org/jooq/lambda/tuple/Tuple8.java