The AmazonSqsTransport expects urlencoded user and password (because secrets contains + and /), same for all Mailer/Notifier bridges (decoded by Dsn::fromString) but AmqpTransport does not.

This leads to several issues (reported on Slack) about people not being able to setup the AWS credentials (AWS often provide secret with / or +).

What should be the right behavior? how to setup a AMQP password with special char in DSN? How keeping BC compatibility?