Only apply hack if exactly metadata from kusama 1032 (#1695)

packages/metadata/src/Metadata/Metadata.ts

@@ -6,6 +6,7 @@ import { Registry } from '@polkadot/types/types';
 
 import { bnToU8a, isHex, hexToU8a, u8aConcat } from '@polkadot/util';
 
+import hackKusama1032 from './v10/static.polkadot';
 import { MAGIC_NUMBER } from './MagicNumber';
 import MetadataVersioned from './MetadataVersioned';
 
@@ -28,9 +29,9 @@ export default class Metadata extends MetadataVersioned {
      * There was a fk-up in the metadata upgrade process: Kusama's metadata got
      * updated to a non-backward-compatible way, but the metadata version
      * stayed at v9. Then v10 was merged in Substrate but not Kusama. Here,
-     * we're just saying that if it's a v9 metadata, decode as v10.
+     * we're just saying that if it's Kusama's metadata, decode as v10.
      */
-    if (isHex(_value) && _value.startsWith('0x6d65746109')) {
+    if (isHex(_value) && _value === hackKusama1032) {
       return Metadata.decodeMetadata(registry, _value.replace('0x6d65746109', '0x6d6574610a'));
     }
 

packages/metadata/src/Metadata/v10/Metadata.spec.ts

@@ -4,7 +4,9 @@
 
 import { TypeRegistry } from '@polkadot/types';
 
+import polkadotJson from './static-polkadot.json';
 import substrateJson from './static-substrate.json';
+import polkadotData from './static.polkadot';
 import substrateData from './static';
 import { decodeLatestSubstrate, defaultValues, toLatest } from '../util/testUtil';
 
@@ -17,3 +19,13 @@ describe('MetadataV10 (substrate)', (): void => {
 
   defaultValues(registry, substrateData);
 });
+
+describe('MetadataV10 (polkadot)', (): void => {
+  const registry = new TypeRegistry();
+
+  decodeLatestSubstrate(registry, 10, polkadotData, polkadotJson);
+
+  toLatest(registry, 10, polkadotData);
+
+  defaultValues(registry, polkadotData);
+});

packages/metadata/src/Metadata/v9/Metadata.spec.ts

@@ -8,7 +8,7 @@ import substrateJson from './static-substrate.json';
 import substrateData from './static';
 import { decodeLatestSubstrate, defaultValues, toLatest } from '../util/testUtil';
 
-describe.skip('MetadataV9 (substrate)', (): void => {
+describe('MetadataV9 (substrate)', (): void => {
   const registry = new TypeRegistry();
 
   decodeLatestSubstrate(registry, 9, substrateData, substrateJson);