I don't think that's a very useful definition of exactness. The article is quoting the Ruby float documentation itself, for one thing. Perhaps it would be clea

I don't think that's a very useful definition of exactness. The article is quoting the Ruby float documentation itself, for one thing. Perhaps it would be clearer to say that floats and floating point operations are deterministic, so you don't have to convince someone that 0.30000000000000004 is the exact answer to 0.1 + 0.2