composer: Configuration defined for http.basic configuration values is not listed as expected with composer config

Hello everybody,

composer config does not display the appropriate value for http-basic when we use composer config -l. See the example bellow:

echo "{}" > composer.json
rm auth.json
test -f composer || (curl -sS https://getcomposer.org/installer | php -- --filename=composer)
./composer self-update
./composer config -a -f composer.json http-basic.subdomain.domain.com "username" "password";
./composer config -a -f composer.json http-basic.subdomain2.domain.com "username2" "password2";
cat auth.json

{
    "http-basic": {
        "subdomain.domain.com": {
            "username": "username",
            "password": "password"
        },
        "subdomain2.domain.com": {
            "username": "username2",
            "password": "password2"
        }
    }
}

./composer config -l -f composer.json | grep http-basic

[http-basic.subdomain.domain.com.username] username
[http-basic.subdomain.domain.com.password] password
[http-basic.subdomain.domain.subdomain2.domain.com.username] username2
[http-basic.subdomain.domain.subdomain2.domain.com.password] password2

i expect it to be:

[http-basic.subdomain.domain.com.username] username
[http-basic.subdomain.domain.com.password] password
[http-basic.subdomain2.domain.com.username] username2
[http-basic.subdomain2.domain.com.password] password2

This is a problem when we try to scripting these configuration values.