gh-143831: Compare cells by identity in forward references #143848
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Cells are mutable and, in regular comparison, they are equal when their contents are equal (or if both are empty).
Two different cells should not be considered equal by value in forward references, though.
If there are two separate cells, they either (1) target different variables or (2) belong to different scopes, so two separate forward references storing two separate cells are conceptually unequal even if these cells happen to be equal at a given point in time. Mutability, essentially.
I'm still working on tests.
TypeError: unhashable type: 'cell'#143831