Store internals: Refactor RootStore/ToState to "Core" protocol composition
#3460
+801
−638
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Inspired by
UIBinding's internals, this pull request refactorsStorefrom a fully type-erased internalRootStoreclass and concretely composed key paths and closures using the internalToStatetype to a more efficient internal protocol composition called "Core".Corepreserves the underlyingStateandActiongenerics, avoiding unneeded, forced existential casts and it preserves the structure of individual key paths rather than appending the key paths directly, which is even known to be buggy. Benchmarks show an overall performance win here, if marginal, and the resulting code should be safer.