FFI safety is now explicitly given #229
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User should now specify unsafe/safe/interruptible explicitly.
constructors and destructors are always unsafe (this should be taken granted. C++ library should not call Haskell back inside constructor/destructors). Accessor functions (getter/setter) are also unsafe.
On the other hand, calling an instance of
std::function(which is hard-coded inFFICXX.Runtime.Function.TH) should be unconditionally safe.