Unclear It is not clear which modules run in this environment, so it is unclear whether you can use it.
What
A sandbox is a restricted environment that limits what code can do. In one such environment for modules, a clock.sleep call is now available alongside clock.now, which was there before.
Why
It lets that code wait for a while, not only read the current time.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear which modules run in this environment, so it is unclear whether you can use it.