Zip two sequences together, padding the shorter sequences with nils

Sequence+zipPadded.swift

/// Zip two sequences together, padding the shorter sequence with nil
func zipPadded<Value1, Value2>(_ z1: any Sequence<Value1>, _ z2: any Sequence<Value2>) -> [(Value1?, Value2?)] {

	var v1 = z1.makeIterator() as any IteratorProtocol<Value1>
	var v2 = z2.makeIterator() as any IteratorProtocol<Value2>

	var vv1 = v1.next()
	var vv2 = v2.next()

	var result = [(Value1?, Value2?)]()
	while vv1 != nil || vv2 != nil {
		result.append((vv1, vv2))
		vv1 = v1.next()
		vv2 = v2.next()
	}
	return result
}