Method: Clear out the previewed-applied flag for a multidimensional-aggregated value whenever its post value is updated.
Source: wp-includes/class-wp-customize-setting.php:432
Method: Fetch the value of the setting.
Source: wp-includes/class-wp-customize-setting.php:737
Method: Callback function to filter non-multidimensional theme mods and options.
Source: wp-includes/class-wp-customize-setting.php:448
Filter Hook: Filters a Customize setting value not handled as a theme_mod or option.
Source: wp-includes/class-wp-customize-setting.php:768