I'm developing a Wave gadget. It sets a callback function for
setStateCallback() and setParticipantCallback(), which apparently gets
called immediately, three times (I'm guessing once for the
setStateCallback and once each for the two participants).

The callback function (updateDisplay) calls another internal function
which calls wave.getState(). Well, the first time it calls
wave.getState() I get a JS error saying that wave.getState() is null,
which I guess means it hasn't been initialized yet. So my question is,
why is wave calling the callbacks before the wave object is fully
initialized, or am I doing something wrong?

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