[crazygringo]

Well right now you basically can't ever check for equality with floating-point arithmetic and trust that two numbers that should intuitively be equal are reported as equal.

For me, floating-point equality would be if there are any parts that overlap. Basically "=" would mean "to the extent of the floating-point accuracy of this system, these values could be equal".

If you're doing a reasonably limited number of operations with values reasonably larger than the error range, then it would meet a lot of purposes -- you can add 0.5 somewhere in your code, subtract 0.5 elsewhere, and still rely on the value being equal to the original.