Post #1782149

@simon_brooke wrote: «How close is 'practically indistinguishable' remains an open question, of course, and probably needs to be runtime-configurable, because for some calculations those very small discrepancies may be important.» Indeed, on all these counts. I think (but don't trust me on this) that when it becomes necessary, high-quality numerical algorithms even adapt to the particular _values_ during specific stages of computation. Lots of devils in these details. Deliver us from numerical instability... @screwlisp