Some extended sexpr notations (particularly those used in Common Lisp, although many Schemes also support it, as do other lisps) support self-referential data s

Some extended sexpr notations (particularly those used in Common Lisp, although many Schemes also support it, as do other lisps) support self-referential data structures. fds and sockets CAN, IIRC, to some degree, be sent to other processes on the same machine, but it's fairly limited. As for serializing closures, CHICKEN Scheme's s11n egg is the most prominent, although not the only, example. It's fairly limited, once again, to avoid sending the forest with the bannana, as Joe Armstrong would put it. This has nothing to do with our discussion, I just thought it was cool.