SoftCleanable and WeakCleanable

[Florian Weimer]

* Florian Weimer:

> * Alan Bateman:
>
>> On 01/08/2020 10:23, Florian Weimer wrote:
>>> Are jdk.internal.ref.SoftCleanable and jdk.internal.ref.WeakCleanable
>>> actually used?
>>>
>>> CleanerTest rests them, but I don't see any other mentions of these
>>> classes.
>
>> Do you mean used outside of the cleaner implementation? Maybe you are 
>> looking to change them to non-public?
>
> It's not clear to me how the cleaner implementation itself uses them.
> java.lang.ref.Cleaner only needs PhantomCleanableRef.

Any further comments on this topic?  Thanks.