Movement against float.init being nan

[Walter Bright]

On 8/20/2022 4:51 AM, Adam D Ruppe wrote:
> That works for float.init specifically, but if you've done some operation on it 
> and ended up with a nan, that will not necessarily be true since nans come in 
> several bit patterns.

I.e. a "payload" can be put in the mantissa bits of a NaN, which can be used to 
provide more information about the NaN. I've never seen anyone use this, though, 
but someone might, so isNaN() is the robust approach.