Feature Request: Floating-Point ttl about cached HOT 4 OPEN

It's not currently possible, but I'd be happy to accept a PR if you can get to it before I have time to work on it. It would be pretty straightforward to add support to the TimedCache and TimedSizedCache to accept a subsecond_nanos so the pair of (seconds, subsec_nanos) can be compared against the pair that makes a Duration. Then there's several places in the impl of both cache types that need to be updated to include checking subsec nano (ex. here and here), and also adding a macro argument for it (around here)

from cached.

@jaemk
I am interested in implementing this and submitting a pull request. Although I have a few implementation concerns/questions. I'm guessing that changing the outward facing API in a breaking way would be a concern of yours.

What should be done about the following functions to allow subsecond TTL?

• TimedCache::with_lifespan
• TimedCache::with_lifespan_and_capacity
• TimedCache::with_lifespan_and_refresh
• Cached::cache_lifespan
• Cached::cache_set_lifespan

New versions of all of these could be created with the ability to pass in a lifespan with additional subsecond_nanos, but the function names seem to get quite long and redundant. It also seems beneficial to switch the internal representation of the lifespan to a Duration.
It seems like it would be nice to just pass in a duration as the lifespan, but that would be a breaking API change.

from cached.