DATABASE_URL 127.0.0.1 versus localhost

[Mynyx]

The Databases / Doctrine documentation (https://symfony.com/doc/current/doctrine.html#configuring-the-database) contains various examples for DATABASE_URL with 127.0.0.1 as host.

Using localhost as host would have the advantage that a faster Unix domain socket is used, if available, instead of TCP/IP:

Note: Unix only: When the host name is set to "localhost", then the connection to the server is made through a domain socket. ...
https://www.php.net/manual/en/ref.pdo-mysql.connection.php#refsect1-ref.pdo-mysql.connection-notes

Are there any other differences between 127.0.0.1 and localhost which make 127.0.0.1 appear preferable?

[lacatoire]

Good point! The docs use 127.0.0.1 for portability across environments (Docker, CI, Windows…), but your tip about localhost using Unix sockets is valid for local Unix setups. I don't think this warrants a docs change though.