Add metadata v10/11, blake2_128concat hasher (#1691)

* v11, blake2_128concat

* MetadataAll

* Add storage hasher v4 and v10

* Make lint pass

* Add correct interfaces

* Fix lint

* Update metadata definitions

* Update v10 metadata

* Update packages/types/src/interfaces/utility/definitions.ts

* Update v11

* Add HACK

* Skip v9 tests (part of HACK)

* Correct function names

Co-authored-by: Amaury Martiny <amaury.martiny@protonmail.com>

packages/metadata/src/Metadata/Metadata.ts

@@ -23,6 +23,17 @@ export default class Metadata extends MetadataVersioned {
   // we adjust with the magic number and a manual version and re-try. As soon as
   // we remove support for V0, we will just do a new here
   private static decodeMetadata (registry: Registry, _value: Uint8Array | string = new Uint8Array()): MetadataVersioned {
+    /**
+     * HACK 01.02.2020
+     * 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.
+     */
+    if (isHex(_value) && _value.startsWith('0x6d65746109')) {
+      return Metadata.decodeMetadata(registry, _value.replace('0x6d65746109', '0x6d6574610a'));
+    }
+
     const value = isHex(_value)
       ? hexToU8a(_value)
       : _value;