REST API: Enable sanitize_callback to return WP_Error.
Give developers the opportunity to reject incoming data without using the validation callback. It also enables us to do sanitization and validation in one function in instances where this could be useful. Props websupporter, rmccue. Fixes #37560. Built from https://develop.svn.wordpress.org/trunk@38601 git-svn-id: http://core.svn.wordpress.org/trunk@38544 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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