a few less controversial changes for starters

Author: mattpolzin

Sources/JSONAPI/Error/BasicJSONAPIError.swift

@@ -39,7 +39,7 @@ public struct BasicJSONAPIErrorPayload<IdType: Codable & Equatable>: Codable, Eq
         self.source = source
     }
 
-    public struct Source: Codable, Equatable {
+    public struct Source: Codable, Equatable, Sendable {
         /// a JSON Pointer [RFC6901] to the associated entity in the request document [e.g. "/data" for a primary data object, or "/data/attributes/title" for a specific attribute].
         public let pointer: String?
         /// which URI query parameter caused the error
@@ -70,6 +70,8 @@ public struct BasicJSONAPIErrorPayload<IdType: Codable & Equatable>: Codable, Eq
     }
 }
 
+extension BasicJSONAPIErrorPayload: Sendable where IdType: Sendable {}
+
 /// `BasicJSONAPIError` optionally decodes many possible fields
 /// specified by the JSON:API 1.0 Spec. It gives no type-guarantees of what
 /// will be non-nil, but could provide good diagnostic information when
@@ -100,4 +102,4 @@ public struct BasicJSONAPIErrorPayload<IdType: Codable & Equatable>: Codable, Eq
 ///     with non-nil values in a flattened way. There will be no `source` key
 ///     but there will be `pointer` and `parameter` keys (if those values
 ///     are non-nil).
-public typealias BasicJSONAPIError<IdType: Codable & Equatable> = GenericJSONAPIError<BasicJSONAPIErrorPayload<IdType>>
+public typealias BasicJSONAPIError<IdType: Codable & Equatable & Sendable> = GenericJSONAPIError<BasicJSONAPIErrorPayload<IdType>>

Sources/JSONAPI/Error/GenericJSONAPIError.swift

@@ -8,7 +8,7 @@
 /// `GenericJSONAPIError` can be used to specify whatever error
 /// payload you expect to need to parse in responses and handle any
 /// other payload structure as `.unknownError`.
-public enum GenericJSONAPIError<ErrorPayload: Codable & Equatable>: JSONAPIError, CustomStringConvertible {
+public enum GenericJSONAPIError<ErrorPayload: Codable & Equatable & Sendable>: JSONAPIError, CustomStringConvertible {
     case unknownError
     case error(ErrorPayload)
 

Sources/JSONAPI/JSONAPICodingError.swift

@@ -13,7 +13,7 @@ public enum JSONAPICodingError: Swift.Error {
     case missingOrMalformedMetadata(path: [CodingKey])
     case missingOrMalformedLinks(path: [CodingKey])
 
-    public enum Quantity: String, Equatable {
+    public enum Quantity: String, Equatable, Sendable {
         case one
         case many
 

Sources/JSONAPI/Resource/Id.swift

@@ -31,7 +31,7 @@ extension String: RawIdType {}
 /// A type that can be used as the `MaybeRawId` for a `ResourceObject` that does not
 /// have an Id (most likely because it was created by a client and the server will be responsible
 /// for assigning it an Id).
-public struct Unidentified: MaybeRawId, CustomStringConvertible {
+public struct Unidentified: MaybeRawId, CustomStringConvertible, Sendable {
     public init() {}
 
     public var description: String { return "Unidentified" }

Sources/JSONAPI/Resource/Poly+PrimaryResource.swift

@@ -15,12 +15,12 @@ import Poly
 /// disparate types under one roof for
 /// the purposes of JSON API compliant
 /// encoding or decoding.
-public typealias EncodableJSONPoly = Poly & EncodablePrimaryResource
+public typealias EncodableJSONPoly = Poly & EncodablePrimaryResource & Sendable
 
 public typealias EncodablePolyWrapped = Encodable & Equatable
 public typealias CodablePolyWrapped = EncodablePolyWrapped & Decodable
 
-extension Poly0: CodablePrimaryResource {
+extension Poly0: @retroactive Encodable, @retroactive Decodable {
     public init(from decoder: Decoder) throws {
         throw JSONAPICodingError.illegalDecoding("Attempted to decode Poly0, which should represent a thing that is not expected to be found in a document.", path: decoder.codingPath)
     }
@@ -30,6 +30,8 @@ extension Poly0: CodablePrimaryResource {
     }
 }
 
+extension Poly0: CodablePrimaryResource {}
+
 // MARK: - 1 type
 extension Poly1: EncodablePrimaryResource, OptionalEncodablePrimaryResource
     where A: EncodablePolyWrapped {}

Sources/JSONAPI/Resource/Resource Object/ResourceObjectDecodingError.swift

@@ -13,7 +13,7 @@ public struct ResourceObjectDecodingError: Swift.Error, Equatable {
 
     static let entireObject = "entire object"
 
-    public enum Cause: Equatable {
+    public enum Cause: Equatable, Sendable {
         case keyNotFound
         case valueNotFound
         case typeMismatch(expectedTypeName: String)
@@ -26,7 +26,7 @@ public struct ResourceObjectDecodingError: Swift.Error, Equatable {
         }
     }
 
-    public enum Location: String, Equatable {
+    public enum Location: String, Equatable, Sendable {
         case attributes
         case relationships
         case relationshipType