> On Mar 15, 2016, at 11:59 PM, Greg Parker via swift-dev <swift-dev@swift.org> 
> wrote:
> I am considering a new representation for Swift refcounts and other 
> per-object data. This is an outline of the scheme. Comments and suggestions 
> welcome.

There are a lot of really good ideas.  I would like to see some quasi-specifics 
about the proposed bit layout of the inline reference count, however.  You said 
that there would still be an inline unowned reference count; is that now 
tracked independently of the weak reference count?  And do we still have an 
efficient fast path for testing uniquely-reference-or-pinned?

John.
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