wp-includes/customize/class-wp-customize-background-image-setting.php:34$valuemixedtrue public function update( $value ) { remove_theme_mod( 'background_image_thumb' ); return true; }Introduced in 3.4.0. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
none to true.verified against sourcesrc/wp-includes/customize/class-wp-customize-background-image-setting.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.