Perf: cache edges#226
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computing edges is fast, but it gets called a lot, e.g. in 1000 iterations of the kitchen sink, it's called 15,924 times, which is 0.549 cumulative seconds (2.58% of total time)
so... just cache it. this shouldn't change during the lifespan of a node.
📚 Documentation preview 📚: https://noob--226.org.readthedocs.build/en/226/