1.x: Fix zip() - observer array becoming visible too early and causing NPE #3688
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Reported in #3687.
By the way, I see several other small problems with zip: it is implemented as an
Operator
and even though one can know the number of sources upfront, this indirection hides the fact. In addition, it uses SpMc queue but could just use Spsc because there is only one drain thread at a time.