faster-minikanren
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`vars` may produce duplicates
https://github.com/michaelballantyne/faster-minikanren/blob/dc5390aca787e7c40177c420171715d728fdb65a/mk.scm#L565-L571
When term
is a pair such as (,x . ,x)
, the result would include two instances of the var. Not sure if this would lead to bad reification later or not.