https://plugins.trac.wordpress.org/browser/advanced-woo-search/tags/1.99/includes/class-aws-search.php#L222
https://plugins.trac.wordpress.org/browser/advanced-woo-search/tags/2.00/includes/class-aws-search.php?rev=2290090#L219
https://wordpress.org/plugins/advanced-woo-search/#developers
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