This goes against how 2.3 works in general - functions don't share local scope.
I can add the ability to pass an optional argument into live_execute_string so that you could pack up all your variables of interest into an array or a struct.
That makes sense, live_execute_string_ext() would be reasonable.
Anyways, now that snippets are fixed, there's no real need for that I guess (why use live_execute_string() over snippets)
I think that this is just a very low priority feature
