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Goals
We pass one a "Block" interface for subscribers for BlockQueued and BlockSent hooks. The interface has no access to the data, but right now we hold a reference the raw block data in the implementing struct, and use it to calculate values. There's no need for this and ... eek... this could be a huge memory leak vector. It would also explain partly why we've had trouble replicating memory leaks in testplans -- it would be dependent on the behavior of the subscriber.
Anyway, can't hurt, and defensive programming