query.go
func Skip(subject Enumerable, n uint) Enumerable {
	return skipper{
		original:  subject,
		skipCount: n,
	}
}
func Skip(subject Enumerable, n uint) Enumerable {
	return skipper{
		original:  subject,
		skipCount: n,
	}
}
// Skip creates a reusable stream which will skip the first `n` elements before iterating
// over the rest of the elements in an Enumerable.