This field reports the type of the transition (`obs_stinger_transition`, `fade_to_color_transition`, etc), which can be useful for code which needs to react differently depending on what type of transition is being played.
Of note is that OBS calls this an `id`, but I think that's kind of a misleading name. `type` seems like a more semantic name for this information to me, but I'm open to changing it if we want to stay consistent with the nomenclature that OBS itself uses.
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