Think about moving payload validation outside of the library

[joekarl]

Basically because message validation is done behind the channel interface, there's no good way to get back errors if a payload is bad.
Thinking about moving payload validation to an exposed method so that users can pre-validate their messages if they want to.
Will still leave checks in place internally for saneness but will allow preemptive catching of potential errors.

[pjebs]

I like this idea. Make the library as fast as possible.