Allow null values in bundles min/max (#3950)

* Allow null values in bundles min/max

* Adjust bundle type definition

* Backwards compat

* Lenient types

packages/api/test/typesBundleDerive.spec.ts

@@ -150,7 +150,7 @@ const typesBundle = {
 
       types: [
         {
-          minmax: [0, undefined] as [number?, number?],
+          minmax: [0, undefined],
           types: {
             Balance: 'u64',
             BalanceOf: 'Balance',

packages/types-known/src/bundle.ts

@@ -7,7 +7,7 @@ import type { Hash } from '@polkadot/types/interfaces';
 import type { ChainUpgradeVersion, CodecHasher, DefinitionRpc, DefinitionRpcSub, OverrideModuleType, OverrideVersionedType, Registry, RegistryTypes } from '@polkadot/types/types';
 import type { BN } from '@polkadot/util';
 
-import { bnToBn, isUndefined } from '@polkadot/util';
+import { bnToBn, isNull, isUndefined } from '@polkadot/util';
 
 import typesChain from './chain';
 import typesModules from './modules';
@@ -22,8 +22,8 @@ export { packageInfo } from './packageInfo';
 function filterVersions (versions: OverrideVersionedType[] = [], specVersion: number): RegistryTypes {
   return versions
     .filter(({ minmax: [min, max] }) =>
-      (isUndefined(min) || specVersion >= min) &&
-      (isUndefined(max) || specVersion <= max)
+      (isUndefined(min) || isNull(min) || specVersion >= min) &&
+      (isUndefined(max) || isNull(max) || specVersion <= max)
     )
     .reduce((result: RegistryTypes, { types }): RegistryTypes => ({
       ...result,

packages/types/src/types/registry.ts

@@ -46,7 +46,8 @@ export interface RegistryError {
 }
 
 export interface OverrideVersionedType {
-  minmax: [number?, number?]; // min (v >= min) and max (v <= max)
+  // min (v >= min) and max (v <= max)
+  minmax: [number | undefined | null, number | undefined | null] | [number?, number?] | (number | undefined | null)[];
   types: RegistryTypes;
 }