So, even if, in C, you may be able to apply arithmetic operations to a
time_t, you can't be sure it makes sense, so you shouldn't normally do
it. Why then, make it easier in Foreign.C to do something meaningless
? That's just begging to shoot yourself in the foot.
Because you need to convert it from a foreign representation, which may require arbitrary math depending on the details of that representation. And, while there may not be a strict meaning applied by the standard, there *is* a platform-dependent strict meaning (else times would be useless) *and* the conversion between the FFI and Haskell representations will need to know that platform-dependent meaning so that it can do a meaningful conversion.