[sugar] Proper D-Bus usage (was Re: October 29 - Tarballs due for 0.83.1)

[Benjamin M. Schwartz]

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Tomeu Vizoso wrote:
> And see xattrs for a design that
> avoids this mess.

xattr values are also just bytes with no type, and so will have exactly
the same problem.  Their behavior would be equivalent to D-Bus's a{ayay}.

Python's behavior in this domain is also in flux.  Python 3.0 will have
separate types for unicode strings and unencoded bytestrings.

- --Ben
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