he/him 
When writing Babel plugins, what can I assume about the same node being processed more than once? When or how can this happen? What are common protections if I don't want my annotations to appear twice? Should I always check if I've "seen" this node already?
To be more technical with an explanation. There's a Path#requeue method which will requeue a path/node for retraversal. It's called by Path#replaceWith and Path#replaceWithMultiple. There's a priority and then a normal queue that decides what order to process.
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The more I try to explain it the more confusing it is. The whole traversal model is so convoluted, but it's fairly tied to the entire Babel architecture.
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