ExploreUnion breaks/ignores ExploreInterpretAs

[magik6k]

It looks like ExploreUnions .Explore essentially "skips over" the ExploreInterpretAs because it's calling .Explore on it, which then returns the InterpretAs sub-selector (instead of InterpretAs)

[rvagg]

Putting this on the board and assigning myself but it's not going to be quick if it's up to me to get to it so if anyone else wants to get to this before I do then please don't let my name in "Assigned To" be a blocker!