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Jon Ross-Perkins
2e297b5258
Trying to build a type around the common idiom we have for types based on an Id range. The primary advantage of this is it makes clear the `Id` association, and drops the `.index` use. Lowering was motivating me because it has a few of these, and check probably has more (e.g. `tree_and_subtrees_getters`), but I'm just changing a handful of examples to show the concept and see if there's agreement. I wanted to inherit from ValueStoreTypes, but name lookup didn't seem to find the types without `using` statements, at which point there didn't seem to be much reason to use inheritance.