What does/will Austral do on out of stack memory? Assuming it maps tail calls to branches, the call stack still grows on the non-tail calls. Options I'm aware

What does/will Austral do on out of stack memory? Assuming it maps tail calls to branches, the call stack still grows on the non-tail calls. Options I'm aware of are die (optionally gracefully), allocate more stack (segments or moving), allocate a lot of address space up front and then die on exhaustion. Asking because I think there's a reasonable argument that out of heap and out of stack are the same category, and the docs discuss returning optional from allocating functions, but not tagging all functions with an optional to indicate out of stack.