Optimize transform systems to only run on change #417
Merged
+226
−39
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Partially implements #63. I'm aware that there is some work being done to rewrite transforms in #229 and #374, but this was an easy way to get my feet wet and could potentially serve as an example for more work in #63. It's also unclear what the timeline for that is.
This is the first Rust contribution I've ever made, so undoubtedly I have made a mistake somehow.
This PR also adds
Or
to the prelude, which I can move to a separate PR if you like.