discrepancy between kafka and rabbitmq binder

Describe the issue
When I send a message with a header containing an UUID, it is received on the other end as an UUID with the kafka binder, but as a String with the rabbitmq binder. This causes code that checks for equality to fail.

To Reproduce
Send

MessageBuilder.withPayload("").setHeader("foo", UUID.randomUUID());

Receive

"8554052e-da16-4f83-a152-3f083d238386".equals(message.getHeaders().get("foo")) // works with rabbitmq, doesn't work with kafka

Version of the framework 3.0.3.RELEASE
Expected behavior
The default simple code should behave the same accross binders

Additional context
To fix this, I know I can use

"8554052e-da16-4f83-a152-3f083d238386".equals(message.getHeaders().get("foo").toString()) // toString workaround

but this is a workaround for the fact that I don't get the same object across binders. Should they all return an UUID because that's what I sent ? Or a String because the sender should have called toString() on the input ?