The review of SE-0295 - Codable Synthesis for enums with Associated Values has concluded and the proposal is accepted. You can find the 1st and 2nd rounds of reviews here and here respectively.
There was general consensus that the solution would help a number of users, even if the encoding was not unanimously agreed upon. The core team does not believe that
Codable represents the complete solution for the needs of serialization. There is a new thread which discusses the various requirements of the serialization solution in Swift.
Thank you to everyone who participated in the review, the input was useful and helped shape the proposal.