Function erase 

pub fn erase<K, V>(
    objects: &ObjectMapRef<K, V>,
    status: &StatusRef,
    overhead_manager: &OverheadManagerRef,
    maybe_key: Option<EraseKey<'_, K>>,
) -> Result<(HashedKey, Object<K, V>), CacheError>
where
    K: Eq + TypeSize,
    V: TypeSize,