Nope. It's a way of saying "After the penultimate parameter, any further detail should be passed over as a list". The list used to always be an Array, but now

Nope. It's a way of saying "After the penultimate parameter, any further detail should be passed over as a list". The list used to always be an Array, but now it will be possible to have it as any collection type (including IEnumerable<T>).