Expirable
Expirable

An expirable is like a future with a
limited TTL. It is intended to be used
in cases where a Future would be suitable,
but the value fetched usually doesn't change.

Signed-off-by: Esteban RB <2a556e0c598fb58cc03bc88f6340880eea5d22b0@gmail.com>

estebarb/ion,estebarb/ion,estebarb/ion