APFS is case-sensitive on first write and case-insensitive afterwards

APFS on macOS is case-insensitive by default. I guess this is done to keep traditions, since HFS+ (its predecessor) was case-insensitive by default too; and I actually think it is, in general, a good idea. Most persons, technical or not, would usually regard a document titled Financial results the same as Financial Results in the real world; so Apple translated that expectation to the computer…