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Invalid args now cause an `IXR_Error` to be returned. Comprehensive unit tests are also added for the method. Developed in https://github.com/WordPress/wordpress-develop/pull/10690 Follow-up to [1348]. Props josephscott, westonruter. Fixes #64479. Built from https://develop.svn.wordpress.org/trunk@61460 git-svn-id: http://core.svn.wordpress.org/trunk@60772 1a063a9b-81f0-0310-95a4-ce76da25c4cd