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* Introduce diagnostics that explain why derivation of Encodable/Decodable fail rather than just silently failing * Allow properties with default values to be omitted from CodingKeys enum and from encoding/decoding * If `CodingKeys` is a typealias, reach through it more consistently to get at the final target type * Add unit tests to confirm this new behavior for classes and structs NOTE: Although this made the diff bigger, standalone variables named "type" have been renamed to "target" throughout, since the word "type" may be ambiguous and makes debugging impossible. "target" is unique.