> anybody who will ever need to call a sleep function
Bullshit.
I never needed to know what unixtime is when I wrote anything with sleep().
All I needed to know is how long in seconds I want the execution to pause for, never ever I needed to manually calculate something from/to unixtime, even when working with datetimes types.
No, but as a person who has had a need for sleep() before, you are also the type of person who could be expected to know what unix time is.
Nobody is saying that the two things need to be connected, the point is that it can be name dropped in a type definition, and you would know what it means.
