checkPassword should fail if service doesn't exist?

[sztamas]

The checkPassword documentation says:

"This function provides a simple way to verify that a user name and password match
those normally used for Kerberos authentication. It does this by checking that the
supplied user name and password can be used to get a ticket for the supplied service.
If the user name does not contain a realm, then the default realm supplied is used.
..."

Shouldn't this function return False if the service doesn't exist?

>>> import kerberos
>>> kerberos.checkPassword('demo', 'demo', '', 'DOCKERDOMAIN')
True
>>> kerberos.checkPassword('demo', 'demo', 'doesNotExist/kerberos.dockerdomain', 'DOCKERDOMAIN')
True

I would expect the second call to return False.
Is this a bug or am I wrong?

Thanks