wp-includes/class-wp-customize-widgets.php:2082Determines whether the captured option update should be ignored.
$option_namestringbool protected function is_option_capture_ignored( $option_name ) { return ( str_starts_with( $option_name, '_transient_' ) ); }Introduced in 3.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-customize-widgets.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.