Why should continuations need to safely work across language boundaries? Plenty of Schemes support FFIs with the enormous warning that call/cc exists and you sh

Why should continuations need to safely work across language boundaries? Plenty of Schemes support FFIs with the enormous warning that call/cc exists and you should be aware of that. This solution is hugely superior to having none at all; as it means that bindings to foreign libraries may trivially be ported across many Schemes. Choosing the right Scheme will be less about what libraries are available, and more about which provides the best execution environment for your needs. In this case, doing the right thing happens to be doing nothing more than warning the user, as is often the case. Attempting to design a system that safely captures foreign state with continuations is almost certainly an over-engineered solution.