Problem
When making a change to MediaWiki-extensions-CentralAuth this error is thrown by the CI:
<file name="maintenance/deleteLocalPasswords.php">
<error line="61" severity="warning" message="Returning type \Wikimedia\Rdbms\DBConnRef but getUserDB() is declared to return \Wikimedia\Rdbms\IMaintainableDatabase" source="PhanTypeMismatchReturn"/>
</file>or more clearly:
Returning type \Wikimedia\Rdbms\DBConnRef but getUserDB() is declared to return \Wikimedia\Rdbms\IMaintainableDatabase
in the file: maintenance/deleteLocalPasswords.php