Sorry, but an implementation is not a specification. It is not only much harder to read, but it is also a moving target. It is borderline impossible to make an independent implementation of the protocol this way.
Besides, the fact that it is licensed under the GPL might mean that somebody porting the protocol to a different platform / language might be creating a "derived work" which also must be licensed under the GPL.
Sorry, but an implementation is not a specification. It is not only much harder to read, but it is also a moving target. It is borderline impossible to make an independent implementation of the protocol this way.
Besides, the fact that it is licensed under the GPL might mean that somebody porting the protocol to a different platform / language might be creating a "derived work" which also must be licensed under the GPL.