We forgot to deprecate the resultSelector for combineLatest

[benlesh]

As mentioned here: #7168

I think the code in that section was sufficiently complicated as to obscure that we forgot to deprecate that signature.

That gives us two options:

1. Deprecated it now and wait until v9. (Maybe a year?)
2. Just remove it as part of the set of breaking changes in v8.

I'm fine with either, but I'm a little sad if we have to leave it, I was hoping to clean everything up this version.

[demensky]

When I was doing #7156, I was even surprised that it was not marked as @deprecated. I thought that it is needed as well as in fromEvent. But map handles this nicely. Replacing resultSelector with map is pretty easy, so I suggest option 2.

[demensky]

What about zip & forkJoin?

[benlesh]

CORE TEAM: We should be responsible and deprecate until v9. :( Boooo