a7e88e0dad
The omission of Sink: Default is causing me a slight inconvenience in
a test harness. There seems little reason for this and Empty not to
be Clone and Copy too.
I have made all three of these insta-stable, because:
AIUI Copycan only be derived, and I was not able to find any
examples of how to unstably derive it. I think it is probably not
possible.
I hunted through the git history for precedent and found
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