[SR-11145] Also synthesise default CodingKeys when only conforming to Encodable OR Decodable

[swift-ci]

Previous ID	SR-11145
Radar	None
Original Reporter	MrLotU (JIRA User)
Type	Improvement

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Improvement, Codable
Assignee	bendjones (JIRA)
Priority	Medium

md5: ea038e2f6a5b30bf37c1cd332016a054

Issue Description:

Right now when conforming a type to Codable the compiler auto syntesizes the CodingKeys. However, if you conform to either Encodable or Decodable, this does not happen.

I think it'd be a great addition to have the auto synthesised CodingKeys also when not conforming to both Encodable and Decodable.

[swift-ci]

Comment by Owen Voorhees (JIRA)

SE-0166 says:
Types conforming to Encodable whose properties are all Encodable get an automatically generated String-backed CodingKey enum mapping properties to case names. Similarly for Decodable types whose properties are all Decodable

So this could maybe considered a bug fix which doesn't require an evolution proposal?