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GHC allows typeclass instance functions to overlap. This allows any module to change the behaviour of any other part of the code that calls a typeclass function by providing a more specific instance that the one currently being used at that call site. An attacker can use this to change the behaviour of the TCB code. While you can protect against it by only calling typeclass functions with concrete instance types (so they are already the most specific instance) this is not ideal. results ------- Unsafe.