/**
* Strict mapping of the first element
*
* @param fn Mapping function
* @return Tuple8
*/
default <T> PTuple8<T, T2, T3, T4, T5, T6, T7, T8> map1(Function<T1, T> fn) {
if (arity() != 8) return (PTuple8) PTuple7.super.map1(fn);
else return PowerTuples.tuple(fn.apply(v1()), v2(), v3(), v4(), v5(), v6(), v7(), v8());
}
