untyped string arguments that start with a number get cast to that number.
<messagescene "BackgroundChange" "changeBG" ["_3B"] > calls the changeBG function with the argument "_3B"
but
<messagescene "BackgroundChange" "changeBG" ["3B"] >// calls the changeBG function with the number 3
untyped string arguments that start with a number get cast to that number.
<messagescene "BackgroundChange" "changeBG" ["_3B"] > calls the changeBG function with the argument "_3B" but <messagescene "BackgroundChange" "changeBG" ["3B"] >// calls the changeBG function with the number 3