> This has the code smell of trying to use typeclasses for OOP. That won't
work. (Yes, really.)
I am not trying to use OOP, I am just writing some typecasting at all.
> This would be correct. Constraints on an instance are applied *after* the
instance is selected, so when Haskell is looking for an instance, these two
are identical.
I didn't understand why these two instances are identical ? The constraints
are different and OverlappingInstances should permit overlapping typeclasses
in constraints and select more specific instance clause.
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