Make change backwards compatible

Author: dfed

Diff for: Sources/SafeDICore/Models/TypeDescription.swift

@@ -157,7 +157,10 @@ public enum TypeDescription: Codable, Hashable, Comparable, Sendable {
             self = .implicitlyUnwrappedOptional(typeDescription)
 
         case Self.compositionDescription:
-            let typeDescriptions = try values.decode(Set<Self>.self, forKey: .unorderedTypeDescriptions)
+            let typeDescriptions = try values.decodeIfPresent(Set<Self>.self, forKey: .unorderedTypeDescriptions)
+            // For backwards compatibility for when compositions were ordered.
+            // TODO: Delete this backwards compatibility line when we make our next breaking change.
+            ?? values.decode(Set<Self>.self, forKey: .typeDescriptions)
             self = .composition(typeDescriptions)
 
         case Self.someDescription: