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Code quality changes included: - Expands `annotations` parameter documentation with detailed descriptions for readonly, destructive, and idempotent properties. - Standardizes type order from `null|bool` to `bool|null` per coding standards. - Adds validation check to ensure permission callback is callable before invocation. Developed in https://github.com/WordPress/wordpress-develop/pull/10431. Follow-up for [61067], [61032]. See #64134. Built from https://develop.svn.wordpress.org/trunk@61086 git-svn-id: http://core.svn.wordpress.org/trunk@60422 1a063a9b-81f0-0310-95a4-ce76da25c4cd