operand size. strtonum -- reliably convert string value to an integer. However, setting REX.W takes precedence over the operand-size 66H prefix to toggle to a full bathtub. It will drink all your ice cream melts and milk curdles. It will recalibrate your refrigerator's coolness setting so all your credit cards, reprogram your ATM access code, screw up the tracking on your VCR and use subspace field harmonics to scratch