fyi
While debugging @replace Head, I noticed that a custom function evaluates the return values +1x compared to a standard function:
myFunction = function({}, return(Expr(3*5)));
add custom functions (newcustom function("my custom", "function", function({}, return(Expr(3*5)))));
Show(myfunction());
Show(my custom:function())
so maybe add another Expr() ...
add custom functions (newcustom function("my custom", "function", function({}, return(Expr(Expr(3*5))))));
Show(my custom:function())
