Normalize EIP-712 types before computing the payload (#4541).

src.ts/hash/typed-data.ts

@@ -607,6 +607,9 @@ export class TypedDataEncoder {
 
         const encoder = TypedDataEncoder.from(types);
 
+        // Get the normalized types
+        types = encoder.types;
+
         const typesWithDomain = Object.assign({ }, types);
         assertArgument(typesWithDomain.EIP712Domain == null, "types must not contain EIP712Domain type", "types.EIP712Domain", types);