Yes but you can check for an empty string after `AbstractSchemaManager::removeDoctrineTypeFromComment` and evaluate to null. IMO we should leave the `Column::getComment()` API to allow null values. Otherwise it is inconsistent. See how you pass the comment to the `Column` instance in `MySQLSchemaManager` for example. If the column comment is not set you pass null so subsequent calls to `Column::getComment()` still return `null` although the API says it only returns `string`.