Get the first state using PairWise

[aytunch]

As stated by the docs:

/// Emits the n-th and n-1th events as a pair.
/// The first event won't be emitted until the second one arrives.

pairwise does not emit the first value, since it is not a pair yet. However this makes using pairwise cumbersome.
Even if the first state emitted is not a pair, I still would like to use it. So maybe we could emit a pair the first time by the help of a dummy constant like pairwise.Empty()

[pairwise.Empty(), 1],     //---->I want to get this
[1, 2],
[2, 3],
etc.

If there is a way to cleanly do this without changing pairwise, I would be very glad to hear your thoughts. Maybe using combine2 somehow?

[frankpepermans]

I'd just use startWith and then pairWise, then you get a pair on the first event already.