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- Add `at`, `indexOf`, and `includes` - Optimize MixedReadOnly which is currently only used by hook return values. Hook return values are typed as Frozen, this change propagates that to return values of aliasing function calls (such as `at`). One potential issue is that developers may pass `enableAssumeHooksFollowRulesOfReact:false` and set `transitiveMixedData`, expecting their transitive mixed data to be mutable. This is a bit of an edge case and already doesn't have clear semantics.