Stack continuity when throwing through a membrane?

[erights]

See Agoric/realms-shim#61

Attn @Jack-Works @ajvincent @jfparadis @ljharb @caridy

Probably best addressed at user level by virtualizing getStack and getStackString ?

[ljharb]

It seems like the issue is that v8 has runtime-unavailable info that it uses to enhance stacks. It seems like any host-only magic is simply no longer an option once any virtualization kicks in.

If we want v8's magic cross-realm stacks in a virtualized environment inside v8, wouldn't v8 have to expose that info to JS?