The reason why POSIX time ignores leap seconds was that it was considered simpler for userspace if you can do things like `time() % 86400` to get the time of da

The reason why POSIX time ignores leap seconds was that it was considered simpler for userspace if you can do things like `time() % 86400` to get the time of day etc without needing to worry about leap seconds, essentially allowing userspace to be ignorant of leap seconds.