| http://www.w3.org/ns/prov#value | - I do not feel like I have a good handle on exactly when the retain cycles do happen and are a problem, but I do know that (1) clang sometimes warns me about them, and (2) it is easy enough to make a weak reference to self and use that inside the block, with no downside (at least, not in your use case and not that I have seen).
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