FYI, the grandparent's meaning for 'optimal' was ambiguous, it didn't necessarily refer to efficiency. Could also be referring to bugs in the system strtod(). OTOH I agree that efficiency is the more likely interpretation, just about.
CS4 is one of the buggiest pieces of software I've ever seen, it was actually pretty shocking.
"Ignorance is the soil in which belief in miracles grows." -- Robert G. Ingersoll