With the advent of Unicode, the concept of upper and lowercase is a quagmire. You need a whole bunch of data to do it right. If your work involves some process

With the advent of Unicode, the concept of upper and lowercase is a quagmire. You need a whole bunch of data to do it right. If your work involves some process whose timely completion depends on how fast ASCII tolower executes, you better shake things up somehow and change the ground rules.