Index: src/wp-includes/class-wp-customize-setting.php
===================================================================
--- src/wp-includes/class-wp-customize-setting.php	(revision 37083)
+++ src/wp-includes/class-wp-customize-setting.php	(working copy)
@@ -645,9 +645,10 @@
 			 *
 			 * @since 3.4.0
 			 *
-			 * @param mixed $default The setting default value. Default empty.
+			 * @param mixed                $default The setting default value. Default empty.
+			 * @param WP_Customize_Setting $this    {@see WP_Customize_Setting} instance.
 			 */
-			$value = apply_filters( "customize_value_{$id_base}", $value );
+			$value = apply_filters( "customize_value_{$id_base}", $value, $this );
 		} else if ( $this->is_multidimensional_aggregated ) {
 			$root_value = self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'];
 			$value = $this->multidimensional_get( $root_value, $this->id_data['keys'], $this->default );