Currently, either a programmer understands that floating point numbers are complicated beasts, or they don't, and get surprised. With interval arithmetic, eith

Currently, either a programmer understands that floating point numbers are complicated beasts, or they don't, and get surprised. With interval arithmetic, either a programmer would understand that floating point numbers are not actually numbers but intervals... or they wouldn't, and get surprised. So I don't really see much upside. If you know that you need interval arithmetic, chances are that you're already using it.