Case sensitivity is addressed in other RFCs relating to email and DNS. > Check if file exists or generate numeric name. Nonsense. You may not be in control of

Case sensitivity is addressed in other RFCs relating to email and DNS. > Check if file exists or generate numeric name. Nonsense. You may not be in control of the names, and checking a file with stat(2) may not address the problem at hand (and: is many orders of magnitude different in cost as well).