Is there any use in importing both ES6 and ES7 core-js polyfills?

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Is it useful or redundant to import the ES6 polyfill for Object

import 'core-js/es6/object';

and also the ES7 polyfill for Object?

import 'core-js/es7/object';

Does the ES7 polyfill cover all of the ES6 features and can I leave the ES6 polyfill out, or does the ES6 polyfill add features not present in the ES7 polyfill?

polyfills javascript
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