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The runtime contains a type check to determine if a user-provided ref is a valid type — a function or object (or a string, when `disableStringRefs` is off). This currently happens during child reconciliation. This changes it to happen only when the ref is passed to the component that the ref is being attached to. This is a continuation of the "ref as prop" change — until you actually pass a ref to a HostComponent, class, etc, ref is a normal prop that has no special behavior.