:p in GHCi debugger is broken for Integer

:p used to do this for Integers:

Prelude> let i = Just (10::Integer)
Prelude> :p i
i = Just 10

but it now does this:

Prelude> let i = Just (10::Integer)
Prelude> :p i
i = Just (_t1::Integer)

but I can't see an obvious reason why.

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