As far as I understand, basic_stack trace is just a container of stacktrace_entries, which are Regular types. So the default distinct-objects type safety rules

As far as I understand, basic_stack trace is just a container of stacktrace_entries, which are Regular types. So the default distinct-objects type safety rules apply. You should be able to, for example, collect the stacktace on one thread, transport it to another and print it.