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Re:What can’t the internet handle in 2022? Apostrophes by GoblinSlayer on Tuesday October 04, 2022 @12:24PM (#33082682)
I think you shouldn't try to reproduce the filesystem name comparison algorithm. Check if file exists or generate numeric name.

I can't find where rfc6531 requires case flattening. The word "case" is used there in the meaning of "situation".

Re:What can’t the internet handle in 2022? Apostrophes by throwaway09223 on Tuesday October 04, 2022 @04:29PM (#33086339)
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).