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The change in gh-4603 made the object returned by `elem.data()` a prototype-less object. That's a desired change to support keys colliding with `Object.prototype` properties but it's also a breaking change so it has to wait for jQuery 4.0.0. A 3.x-only test was added to avoid breaking it in the future on this branch. Fixes gh-4665 Ref gh-4603 Closes gh-4666