[PATCH wayland] server: Make serial number 0 mean invalid

[Bill Spitzak]

The no-serial value really really really needs to be zero. Otherwise you
get all kinds of annoyances with many language wrappers which map zero to
false and all other values to true. I think most will have to resort to
xor'ing the value with the no-serial value, meaning the numerical values
are all different.



On Wed, Sep 30, 2015 at 1:23 PM, Jasper St. Pierre <jstpierre at mecheye.net>
wrote:

>
> In cases where we have two behaviors for serial-aware and
> non-serial-aware operations, I would rather have two different client
> requests.


Absolutely wrong. One of the main reasons for the no-serial value is so
that it is encouraged that unrecognized serial numbers act exactly like the
no-serial case. If sending garbage to the serial-taking message has some
useful result that is not achieved by the no-serial version, then clients
are going to do this. Having a no-serial value avoids this design mistake.
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