Fix .at queries/decoration for pre-V13 metadata (#4000)

* Fix `.at` queries/decoration for pre-V13 metadata

* fields fix (or rather... protection against upcoming change)

packages/types/src/generic/PortableRegistry/PortableRegistry.ts

@@ -418,7 +418,7 @@ export class GenericPortableRegistry extends Struct {
     } else if (path.length && path[path.length - 1].toString() === 'WrapperOpaque') {
       return withTypeString(this.registry, {
         info: TypeDefInfo.WrapperOpaque,
-        sub: this.#createSiDef(fields[0].type)
+        sub: this.#createSiDef(params[0].type.unwrap())
       });
     }
 

packages/types/src/metadata/decorate/index.ts

@@ -27,6 +27,7 @@ export function expandMetadata (registry: Registry, metadata: Metadata): Decorat
     errors: decorateErrors(registry, latest, version),
     events: decorateEvents(registry, latest, version),
     query: decorateStorage(registry, latest, version),
+    registry,
     tx: decorateExtrinsics(registry, latest, version)
   };
 }

packages/types/src/metadata/decorate/types.ts

@@ -3,7 +3,7 @@
 
 import type { DispatchErrorModule, ErrorMetadataLatest, EventMetadataLatest, PalletConstantMetadataLatest } from '../../interfaces';
 import type { StorageEntry } from '../../primitive/types';
-import type { AnyTuple, CallFunction, Codec, IEvent } from '../../types';
+import type { AnyTuple, CallFunction, Codec, IEvent, Registry } from '../../types';
 
 export interface ConstantCodec extends Codec {
   readonly meta: PalletConstantMetadataLatest;
@@ -46,5 +46,6 @@ export interface DecoratedMeta {
   readonly errors: Errors;
   readonly events: Events;
   readonly query: Storage;
+  readonly registry: Registry;
   readonly tx: Extrinsics
 }