Tracking issue: Protocols

[mark-koch]

Tracking issue for implementing the propotol proposal #1046
(Work is being done in the protocols development branch)

[perlinm]

Would this feature allow for generic types? I currently have a variety of utility functions for arrays that I would like to also work with frozenarrays. The desired behavior can be recovered by making two copies of every function (or more, if a function has multiple array arguments) and using function overloading, but this gets very cumbersome very fast.