CAS is broken

[dormando]

Tomash Brechko wrote:
> Hello,
> 
> Unfortunately CAS problems are not over, this time I see that gets
> command doesn't work when more than one key is queried.
> 
> You may try the test at the end of this mail.  When gets is used with
> one key it works OK (not true as we'll see shortly).  But when two or
> more keys are queried, reported CAS value is for the last key, last
> test fails (actually I made the test so, the truth is that flags and
> length are _also_ for the last key :/).

I fixed this with an extensively ugly patch in r646. I didn't commit
your tests with it though; if you think they cover things enough I'll
happily apply.

Thanks for the report! The bug wasn't just in gets for multivalue gets.
Under specific conditions even a single gets could become corrupt.

-Dormando