Shouldn't collection zip functions return streams?

Just a thought: when users use the various collection zip functions, what
they're really saying is that they want to perform the next function
against their collection with the elements compared against some other
value, such as the elements of a parallel collection, or the index.

From that perspective, it seems like the zip functions should be returning
Streams rather than maintain the base collection type. This would make more
sense computationally whenever that next operation they want to perform is
something like a find or an exists, but I also think that it makes more
sense logically as well - by converting to a Stream, the zip isn't actually
being performed at the moment, instead it's more like a just in time
operation on the elements of the collection from that point on.

--Ian

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