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aca9019be0
Add extra error checking (in debug mode) to detect cases where an iterator on "direct" payload IR mappings is invalidated (due to elements being removed). Such errors are hard to debug: they are often non-deterministic; sometimes the program crashes, sometimes it produces wrong results. Even when it crashes, the stack trace often points to completely unrelated code locations. Store a timestamp with each "direct" mapping. The timestamp is increased whenever an operation is performed that invaldiates an iterator on that mapping. A debug iterator is added that checks the timestamp as payload IR is enumerated.