[gilgad13]

> The coordinator communicates with each worker using an improvised JSON-based RPC protocol over a pair of pipes. The protocol is pretty basic because we didn't need anything sophisticated like gRPC, and we didn't want to introduce anything new into the standard library.

Interesting that this does not use `encoding/gob` by these criteria. I think `encoding/gob` is a nice example of what is possible with reflection, and I've certainly learned techniques from reading its implementation, but I haven't seen very many uses in the wild and this certainly would seem like a vote of no-confidence.