wp-admin/includes/upgrade.php:1932Execute changes made in WordPress 3.8.0.
function upgrade_380() { global $wp_current_db_version; if ( $wp_current_db_version < 26691 ) { deactivate_plugins( array( 'mp6/mp6.php' ), true ); }}Introduced in 3.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/upgrade.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.