These are indeed rare features, only very few languages have them: Stackless Python: https://stackless.readthedocs.io/en/2.7-slp/library/stackless/pickling.htm

These are indeed rare features, only very few languages have them: Stackless Python: https://stackless.readthedocs.io/en/2.7-slp/library/stackless/pickling.html https://stackless.readthedocs.io/en/2.7-slp/library/stackles... Also Tcl and some special versions of Java and WebAssembly VMs, Lua with some ugly hacks. I tried to find systems like these: https://github.com/void4/notes/issues/16 https://github.com/void4/notes/issues/16 Challenge for language designers: make this kind of sandboxing work recursively, and 100% securely: https://www.reddit.com/r/ProgrammingLanguages/comments/jxo92o/recursive_scheduling/ https://www.reddit.com/r/ProgrammingLanguages/comments/jxo92...