I'm curious about this. Could you provide an example?

Here's what I'm seeing:

---

JavaScript

    (function() {
      let inc = 0.37;
      let times = 5000;
      let total = 0;
      for (let i = 0; i < 5000; i++) {
        total += inc;
      }
      console.log('expected:', inc \* times);
      console.log('actual:', total);
    })();

expected: 1850

actual: 1849.9999999997679

---

Java

    public class MyClass {
        public static void main(String args[]) {
            double inc = 0.37;
            double times = 5000;
            double total = 0;
            for (double i = 0; i < 5000; i++) {
                total += inc;
            }
            System.out.println("expected: " + (inc \* times));
            System.out.println("actual: " + total);
        }
    }

expected: 1850.0

actual: 1849.9999999997679

---

update: Changing `double` to `float` in Java yields:

expected: 1850.0

actual: 1849.9778

and maybe that lines up with what you meant by "the differences should be a LOT farther than 3 digits", though it's hard to tell what you mean by "differences on the order of 10-20".