Provide access to the reference of Key?

[kxxt]

The APIs provided by moka::sync::Cache seems preventing access to &K. Is it intentional?

It is useful to access &K when K is Arc<str> for example, to clone it.

For my use case, I am building a hashset like cache of ArcStr using Cache<ArcStr, ()>.
Not being able to access &K prevents such use cases.