@mashingan Yeah, that's true. However, the proposed idea would be a very comfortable way to override library's methods. But because of UB now user has to pass either subclass with custom methods or pointers to procs to the library which I find a bit messy.
Imagine a math library which does some calculations. Inside it there's a method to calculate square root. One day user understands that he knows a better and faster square root implementation. How can he "inject" it there? Currently there's no way unless lib authors allow him (in advance) to use some setting like sqrt = ref proc(x: float): float P.S. I came from Python so static programming languages are big pain for me
