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Introducing PredictiveIterator role
After some discussion with Jonathan after the SPW, he felt it was better to move the "count-only" and "bool-only" functionality into a separate role, which could then be used to smartmatch / MMD on, rather than having to see whether it is possible to call a method before calling it. This commit creates that role, with "bool-only" defaulting to booleanizing the result of "count-only".
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