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Initial experience with this feature suggests that instances of MemoryContextCallback are likely to propagate into some widely-used headers over time. As things stood, that would result in pulling memutils.h or at least memnodes.h into common headers, which does not seem desirable. Instead, let's decide that this feature is part of the "ordinary palloc user" API rather than the "specialized context management" API, and as such should be declared in palloc.h not memutils.h.
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