Producer.publish() interface

[alcohol]

Wasn't sure if I should revive #657 or ask a new question, but went with the latter since #657 seems resolved.

Any reason why $headers is not part of the official interface definition? I typehint for ProducerInterface in all my relevant code, but because of this, PHPStan keeps complaining;

 Method OldSound\RabbitMqBundle\RabbitMq\ProducerInterface::publish() invoked with 4 parameters, 1-3 required.