[defrost]

Sarcastic? Okay, if you say so.

Picking out an obvious define function that compares a float with a float sum of that nature should indicate an good understanding of why that might be called wizardry and deserving of a second look.

Hats off to the peer comment that suggested scaling against epsilon rather than simpliy regurging the substitution "as was" from the header.

The scaling is better in general, optional in some specific contexts.