Hi, One of the popular npm modules is node-ffi. We are using it in our code for several different calls, but one of them leads to assertion error in node 3.x or later. As the same code of the node-ffi is working fine with iojs 2.x, node 0.12.x and node 0.10.x and after discussion with node-ffi owners, I came to opening this issue. In our code we are trying to call methods from CoreFoundation.dll,