[WIP] Add an associated AttachmentMetadata type to Attachable.
#824
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This PR adds a new associated type to `Attachable` that can be used to supply additional metadata to an attachment that is specific to that type. Metadata is always optional and the default type is `Never` (i.e. by default there is no metadata.) The `Encodable` and `NSSecureCoding` conformances in the Foundation cross-import overlay have been updated such that this type equals a new structure that describes the format to use as well as options to pass to the JSON encoder (if one is used) and user info to pass to the plist or JSON encoders (if used.) We must use this type even for types that conform only to `NSSecureCoding`, otherwise we get compile-time errors about the type being ambiguous if a type conforms to both protocols and to `Attachable`.
grynspan
added
enhancement
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@swift-ci test |
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This PR adds a new associated type to
Attachablethat can be used to supply additional metadata to an attachment that is specific to that type. Metadata is always optional and the default type isNever(i.e. by default there is no metadata.)The
EncodableandNSSecureCodingconformances in the Foundation cross-import overlay have been updated such that this type equals a new structure that describes the format to use as well as options to pass to the JSON encoder (if one is used) and user info to pass to the plist or JSON encoders (if used.) We must use this type even for types that conform only toNSSecureCoding, otherwise we get compile-time errors about the type being ambiguous if a type conforms to both protocols and toAttachable.Checklist: