[6.x] [core/public/deepFreeze] fix recursive type for better array support (#22904)#22932
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spalger merged 1 commit intoelastic:6.xfrom Sep 11, 2018
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…lastic#22904) The `deepFreeze()` function used by `core.injectedMetadata` uses a recursive type definition to indicate that all of the child types within the passed argument become readonly, which works fine for objects but represents arrays as objects instead of using the `ReadonlyArray<>` type. This PR fixes the type definition to use a `RecursiveReadonlyArray<>` type that properly represents arrays with their methods like `push()`, and iterates into the array properly to propagate `ReadOnly<>`, as proven by the tests.
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Backports the following commits to 6.x: