Drop Metadata V0-V8 (#2634)

* Drop MetadatV0

* Apply suggestions from code review

* Restore asV1

* Remove V0 comment

* Handle DoNotConstruct in enum

* No imports from DoNotConstruct

* Merge & re-generate

* Attempt empty construction

* Drop Metadata from 0-4

* CHANGELOG

* assert(5)

* BE vs LE

* Metadataall to no-construction

* Empty U8a create

* Remove old comment

* Santize handling

* Update CHANGELOG.md

* Drop support for Metadata < 9

* Remove old pre-9 definitions

* Update CHANGELOG.md

* CHANGELOG

* Remove v8-era tests

* v8 tests

packages/types-known/src/index.ts

@@ -9,7 +9,6 @@ import { Text } from '@polkadot/types';
 import { bnToBn, isUndefined } from '@polkadot/util';
 
 import typesChain from './chain';
-import typesMeta from './metadata';
 import typesModules from './modules';
 import typesSpec from './spec';
 import upgrades from './upgrades';
@@ -29,13 +28,6 @@ function filterVersions (versions: OverrideVersionedType[] = [], specVersion: nu
     }), {});
 }
 
-/**
- * @description Based on the metadata version, return the registry types
- */
-export function getMetadataTypes (_registry: Registry, specVersion: number): RegistryTypes {
-  return filterVersions(typesMeta, specVersion);
-}
-
 /**
  * @description Get types for specific modules (metadata override)
  */

packages/types-known/src/metadata.ts

@@ -1,25 +0,0 @@
-// Copyright 2017-2020 @polkadot/types-known authors & contributors
-// SPDX-License-Identifier: Apache-2.0
-
-import { OverrideVersionedType } from '@polkadot/types/types';
-
-// Type overrides based on  metadata versions
-const typesMeta: OverrideVersionedType[] = [
-  {
-    // NOTE this is for support of old, e.g. Alex, old metadata and BlockNumber/Index
-    // This is detected based on metadata version, since this is what we have up-front
-    //   v3 = Alex
-    //   v4 = v1.0 branch
-    minmax: [0, 4],
-    types: {
-      Address: 'GenericAddress',
-      BlockNumber: 'u64',
-      EventRecord: 'EventRecordTo76',
-      Index: 'u64',
-      StakingLedger: 'StakingLedgerTo223',
-      ValidatorPrefs: 'ValidatorPrefsTo145'
-    }
-  }
-];
-
-export default typesMeta;

packages/types-known/src/modules.ts

@@ -11,10 +11,6 @@ const typesModules: Record<string, OverrideModuleType> = {
   balances: {
     Status: 'BalanceStatus'
   },
-  contract: { // old metadata & naming
-    // v2 & v3
-    AccountInfo: 'ContractAccountInfo'
-  },
   contracts: {
     StorageKey: 'ContractStorageKey'
   },