The Fval$ Evaluator is, in my humble opinion, light years ahead of Eval evaluator in flexibility ie it does strings and everything can be considered a string, my own private String Theory ;-))
Here I use it as core idea to my oh Interpreter:
https://www.qb64.org/forum/index.php?topic=3723.0I also use string math, and files tools and others you can find in this thread "and another one for your toolbox"
Don't forget to bookmark this thread for reference to many tools and more importantly ideas bplus uses.
The only thing Eval has going for it is it offers more Basic-like number handling and math like formulas.
Of course if you want to get a little philosophical, physicists are leaning more towards information as the basis or foundation or Theory of Everything, just another String Theory in my book.