Nice to see my comments on their proto3 design doc vindicated, lol. There were a lot of comments on that doc, far more than what you'd usually see. Some of those comments dealt with the misguided decision to basically drop nullability (that is, the `has_` methods) that proto2 had. The team then just deleted all the comments and disabled commenting on the doc and proceeded with their original design much to the consternation of their primary stakeholders.