Keep revisions of changes to your settings in Theme Customizer, and preview rollbacks to their previous states.
_.isEqual. Props westonruter.
temp_customize_sanitize_jsfilter so that other plugins can have a chance to run serialization for the output JS-value (used by Widget Customizer); a more robust solution is needed, as noted in the inline comments. Props westonruter.
Fix handling of settings which contain PHP-serialized values; use
Correct method for updating customizer, by updating settings not by updating controls.
Eliminate strict standards notice Fix customizer control