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Despite magento documented desc as string in phpdoc, it is not typed in param signature. In one of the elasticsuite plugin, it passes array to the setOrder
https://github.com/Smile-SA/elasticsuite/blob/affec096d16194addea273dfa35145a42da4213a/src/module-elasticsuite-virtual-category/Plugin/Widget/ProductsListPlugin.php#L152
as you can see the array is assembled here
https://github.com/Smile-SA/elasticsuite/blob/affec096d16194addea273dfa35145a42da4213a/src/module-elasticsuite-virtual-category/Model/Widget/SortOrder/SkuPosition/Builder.php#L63
So to maintain compatibility with elasticsuite for now, we have to remove the string type, other wise it breaks website if there is a product list widget created.