[kscarlet]

Well written in general. However:

> C++ has method override but it's not the same: you cannot change the behavior of how addition works on two 64-bit integers (such as treating them both as fixed-point numbers).

Wouldn't you just create a 1-field struct/class and override all the arithmetic operators? Or if you're less fixated about using the same operator (like me as a Lisper), invent a method called ADD and use that.

> Changing addition to work on "bignum"s (numbers that have arbitrarily large precision) is a good usecase of overriding the addition operation.

I don't see this as something unique to Forth compared to other languages, even C++.