[Someone]

There are several cases where the file system has monotonically increasing integers that, when overflowing, are unrecoverable errors.

Those counters always are 64 bits, and won’t overflow in normal use (for example, the text says: ”if you created 1,000,000 transactions per second, it would take more than 5,000 centuries to exhaust the available transaction identifiers.”), but I can see people making ‘interesting’ disk images, for example ones where writing to a specific directory is impossible or, depending on how the implementation handles it, even panics the OS.