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I like the concept of truth flags for this.
For me, if it's in my campaign it is canon. It doesn't matter what some other person writes/creates before/after/during that point. My world is the center of my universe....
But once we begin sharing material, my universe blurs and I need to play nicely in the multiverse. While I don't have an issue with multiple realities, others will want to remain very pure and I respect that.
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