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How to drupal_add_js an external and defer script

I’ve spent quite some time on drupal_add_js and didn’t manage to solve this. How can I load an external JavaScript script which will also have the defer attribute?

I want to use this type of syntax:

drupal_add_js('http://example.com/whatever.js', 'external');

But it only produces:

<script src="https://example.com/whatever.js"></script>

I want the end HTML to be:

<script defer="defer" src="https://example.com/whatever.js"></script>
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How to drupal_add_js an external and defer script

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