An ephemeral Option for Rust. When created, this EphemeralOption takes an expiry time and a value, and the EphemeralOption will revert to None after the time runs out.
This can be useful for possibly caching values instead of rerunning an expensive computation to get them. See the examples for a real-world demonstration of this using CPU data and message passing.
NOTE: This crate does use unsafe. If this bothers you, either don't use it or audit the code yourself. It is relatively straightforward, so this should be easy to do. Regardless, the tests pass miri, and everything is carefully tracked through the program, so there shouldn't be any undefined behavior.