[PATCH v12 06/10] KEYS: Consistent ordering for __key_link_begin and restrict check

Mat Martineau [off-list ref] wrote:

Do we go back to the simpler restriction record (just a key pointer, no void*,
no free_data) so we can detect cycles without the stack overhead of a
depth-first search, like this?

Sure.  We can always add data in future.

David
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