diff --git a/Package.resolved b/Package.resolved
index 81285d1..d5dcf55 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -6,7 +6,7 @@
         "repositoryURL": "https://github.com/mattpolzin/Poly.git",
         "state": {
           "branch": "master",
-          "revision": "92d889c2cdc027bb94814187e84d34783ae159ae",
+          "revision": "b2a2198ada7d826903411678e19a6d953f52dcbd",
           "version": null
         }
       }
diff --git a/Sources/JSONAPI/Resource/Poly+PrimaryResource.swift b/Sources/JSONAPI/Resource/Poly+PrimaryResource.swift
index 2e39a78..66aaf63 100644
--- a/Sources/JSONAPI/Resource/Poly+PrimaryResource.swift
+++ b/Sources/JSONAPI/Resource/Poly+PrimaryResource.swift
@@ -17,6 +17,8 @@ import Poly
 /// encoding or decoding.
 public typealias JSONPoly = Poly & PrimaryResource
 
+public typealias PolyWrapped = Codable & Equatable
+
 extension Poly0: PrimaryResource {
 	public init(from decoder: Decoder) throws {
 		throw JSONAPIEncodingError.illegalDecoding("Attempted to decode Poly0, which should represent a thing that is not expected to be found in a document.")
@@ -28,7 +30,7 @@ extension Poly0: PrimaryResource {
 }
 
 // MARK: - 1 type
-extension Poly1: PrimaryResource, MaybePrimaryResource where A: Codable & Equatable {}
+extension Poly1: PrimaryResource, MaybePrimaryResource where A: PolyWrapped {}
 
 // MARK: - 2 types
 extension Poly2: PrimaryResource, MaybePrimaryResource where A: PolyWrapped, B: PolyWrapped {}