Agreed! I also like that declaring a mutable binding is extra code beyond a regular binding rather than something the same (or shorter). At least for me, making

Agreed! I also like that declaring a mutable binding is extra code beyond a regular binding rather than something the same (or shorter). At least for me, making things immutable by default and then only relaxing it when necessary leads to code that tends to be less buggy, and I suspect this might be true for others as well.