Can nb_func be pickled automatically when compiled?

[KKyang]

Is it possible to let nb_func able to be pickled automatically instead of having to write a class with an operator with __reduce__ and __setstate__?

[wjakob]

What does it mean to pickle an nb_func? The internal state will contain pointer addresses to code and data that won't make sense when unpickled within another process with a different memory layout.