append method
Implementation
@override Tuple4<T1, T2, T3, T4> append(Tuple4<T1, T2, T3, T4> t1, Tuple4<T1, T2, T3, T4> t2) =>
new Tuple4<T1, T2, T3, T4>(_value1Monoid.append(t1.value1, t2.value1), _value2Monoid.append(t1.value2, t2.value2), _value3Monoid.append(t1.value3, t2.value3), _value4Monoid.append(t1.value4, t2.value4));