I’m glad you found it in the Apple specification.  I looked, but missed it.  I would absolutely defer to you on your assessment of the decoding.

> On Apr 7, 2016, at 1:46 AM, Serhiy Storchaka <report@bugs.python.org> wrote:
> 
> 
> Serhiy Storchaka added the comment:
> 
> UID is rather int than bytes. And I would use a special UID type.
> 
> According to Apple's sources [1], the size of UID data is tokenL+1, not self._get_size(tokenL).
> 
> [1] http://www.opensource.apple.com/source/CF/CF-1153.18/CFBinaryPList.c
> 
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