Work around issues with FO unification trying to unify terms of

potentially different types, resulting in ill-typed terms due to eta.
Projection expansion now fails gracefully on retyping errors.
The proper fix to unification, checking that the heads for FO
have unifiable types, is currently too strong, adding unnecessary universe
constraints, so it is disabled for now. It might be quite expensive
too also it's not noticeable on the stdlib.

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