Hi @denialdesign
As per my understanding, the arrays.min.js file is the minified version of the default magento2 base utils array.js file. I would recommend you to override this file in your theme and make your changes there.
Here is the path where you can find this file:
vendor\magento\magento2-base\lib\web\mage\utils\arrays.js
Let me know if you have any other query.
Thanks
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