void ICollection <T> .Clear() => Throw.NotSupportedException(nameof(MemberOrderHelper <T>), nameof(ICollection <T> .Clear));
bool ICollection <T> .Remove(T item) { Throw.NotSupportedException(nameof(MemberOrderHelper <T>), nameof(ICollection <T> .Remove)); return(default);
void ICollection <T> .Add(T item) => Throw.NotSupportedException(nameof(MemberOrderHelper <T>), nameof(Add));