diff --git a/packages/api-contract/package.json b/packages/api-contract/package.json
index 816106f0e8..49a28efc92 100644
--- a/packages/api-contract/package.json
+++ b/packages/api-contract/package.json
@@ -22,7 +22,7 @@
     "@babel/runtime": "^7.14.6",
     "@polkadot/api": "5.1.2-7",
     "@polkadot/types": "5.1.2-7",
-    "@polkadot/util": "^7.0.2",
+    "@polkadot/util": "^7.0.3-0",
     "rxjs": "^7.2.0"
   }
 }
diff --git a/packages/api-derive/package.json b/packages/api-derive/package.json
index 585d482025..2131ec271c 100644
--- a/packages/api-derive/package.json
+++ b/packages/api-derive/package.json
@@ -23,12 +23,12 @@
     "@polkadot/api": "5.1.2-7",
     "@polkadot/rpc-core": "5.1.2-7",
     "@polkadot/types": "5.1.2-7",
-    "@polkadot/util": "^7.0.2",
-    "@polkadot/util-crypto": "^7.0.2",
+    "@polkadot/util": "^7.0.3-0",
+    "@polkadot/util-crypto": "^7.0.3-0",
     "rxjs": "^7.2.0"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^7.0.2",
+    "@polkadot/keyring": "^7.0.3-0",
     "@polkadot/rpc-provider": "5.1.2-7"
   }
 }
diff --git a/packages/api/package.json b/packages/api/package.json
index 207e4c5f4f..d51e787e0a 100644
--- a/packages/api/package.json
+++ b/packages/api/package.json
@@ -21,13 +21,13 @@
   "dependencies": {
     "@babel/runtime": "^7.14.6",
     "@polkadot/api-derive": "5.1.2-7",
-    "@polkadot/keyring": "^7.0.2",
+    "@polkadot/keyring": "^7.0.3-0",
     "@polkadot/rpc-core": "5.1.2-7",
     "@polkadot/rpc-provider": "5.1.2-7",
     "@polkadot/types": "5.1.2-7",
     "@polkadot/types-known": "5.1.2-7",
-    "@polkadot/util": "^7.0.2",
-    "@polkadot/util-crypto": "^7.0.2",
+    "@polkadot/util": "^7.0.3-0",
+    "@polkadot/util-crypto": "^7.0.3-0",
     "eventemitter3": "^4.0.7",
     "rxjs": "^7.2.0"
   }
diff --git a/packages/rpc-core/package.json b/packages/rpc-core/package.json
index 8ce8b72ef1..39b412fb59 100644
--- a/packages/rpc-core/package.json
+++ b/packages/rpc-core/package.json
@@ -22,10 +22,10 @@
     "@babel/runtime": "^7.14.6",
     "@polkadot/rpc-provider": "5.1.2-7",
     "@polkadot/types": "5.1.2-7",
-    "@polkadot/util": "^7.0.2",
+    "@polkadot/util": "^7.0.3-0",
     "rxjs": "^7.2.0"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^7.0.2"
+    "@polkadot/keyring": "^7.0.3-0"
   }
 }
diff --git a/packages/rpc-provider/package.json b/packages/rpc-provider/package.json
index 554122b8a0..ecf8000177 100644
--- a/packages/rpc-provider/package.json
+++ b/packages/rpc-provider/package.json
@@ -21,15 +21,15 @@
   "dependencies": {
     "@babel/runtime": "^7.14.6",
     "@polkadot/types": "5.1.2-7",
-    "@polkadot/util": "^7.0.2",
-    "@polkadot/util-crypto": "^7.0.2",
-    "@polkadot/x-fetch": "^7.0.2",
-    "@polkadot/x-global": "^7.0.2",
-    "@polkadot/x-ws": "^7.0.2",
+    "@polkadot/util": "^7.0.3-0",
+    "@polkadot/util-crypto": "^7.0.3-0",
+    "@polkadot/x-fetch": "^7.0.3-0",
+    "@polkadot/x-global": "^7.0.3-0",
+    "@polkadot/x-ws": "^7.0.3-0",
     "eventemitter3": "^4.0.7"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^7.0.2",
+    "@polkadot/keyring": "^7.0.3-0",
     "@polkadot/types": "5.1.2-7",
     "mock-socket": "^9.0.3",
     "nock": "^13.1.1"
diff --git a/packages/typegen/package.json b/packages/typegen/package.json
index 61b9b41305..0dac7c8ed8 100644
--- a/packages/typegen/package.json
+++ b/packages/typegen/package.json
@@ -32,7 +32,7 @@
     "@polkadot/api": "5.1.2-7",
     "@polkadot/rpc-provider": "5.1.2-7",
     "@polkadot/types": "5.1.2-7",
-    "@polkadot/util": "^7.0.2",
+    "@polkadot/util": "^7.0.3-0",
     "handlebars": "^4.7.7",
     "websocket": "^1.0.34",
     "yargs": "^17.0.1"
diff --git a/packages/types-known/package.json b/packages/types-known/package.json
index a88c47a39f..b7cf5ba205 100644
--- a/packages/types-known/package.json
+++ b/packages/types-known/package.json
@@ -20,8 +20,8 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/types-known#readme",
   "dependencies": {
     "@babel/runtime": "^7.14.6",
-    "@polkadot/networks": "^7.0.2",
+    "@polkadot/networks": "^7.0.3-0",
     "@polkadot/types": "5.1.2-7",
-    "@polkadot/util": "^7.0.2"
+    "@polkadot/util": "^7.0.3-0"
   }
 }
diff --git a/packages/types/package.json b/packages/types/package.json
index 240d4d6ead..51fe11adf4 100644
--- a/packages/types/package.json
+++ b/packages/types/package.json
@@ -20,12 +20,12 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/types#readme",
   "dependencies": {
     "@babel/runtime": "^7.14.6",
-    "@polkadot/util": "^7.0.2",
-    "@polkadot/util-crypto": "^7.0.2",
+    "@polkadot/util": "^7.0.3-0",
+    "@polkadot/util-crypto": "^7.0.3-0",
     "rxjs": "^7.2.0"
   },
   "devDependencies": {
-    "@polkadot/keyring": "^7.0.2",
+    "@polkadot/keyring": "^7.0.3-0",
     "@types/bn.js": "^4.11.6",
     "bn.js": "^4.11.9"
   }
diff --git a/packages/types/src/create/createClass.ts b/packages/types/src/create/createClass.ts
index 28a83a7b29..213c813a31 100644
--- a/packages/types/src/create/createClass.ts
+++ b/packages/types/src/create/createClass.ts
@@ -8,6 +8,7 @@ import type { FromReg, TypeDef } from './types';
 import { assert, isNumber, isUndefined, stringify } from '@polkadot/util';
 
 import { BTreeMap, BTreeSet, CodecSet, Compact, DoNotConstruct, Enum, HashMap, Int, Option, Result, Struct, Tuple, U8aFixed, UInt, Vec, VecFixed } from '../codec';
+import { Bytes, Null } from '../primitive';
 import { getTypeDef } from './getTypeDef';
 import { TypeDefInfo } from './types';
 
@@ -36,18 +37,6 @@ export function ClassOf<K extends keyof InterfaceTypes> (registry: Registry, nam
   return ClassOfUnsafe<Codec, K>(registry, name) as any;
 }
 
-function expandLookup (registry: Registry, type: string): keyof InterfaceTypes {
-  if (registry.isLookupType(type)) {
-    const subType = registry.lookup.getTypeDef(type).type;
-
-    if (subType !== type) {
-      return expandLookup(registry, subType);
-    }
-  }
-
-  return type as keyof InterfaceTypes;
-}
-
 function getSubDefArray (value: TypeDef): TypeDef[] {
   assert(value.sub && Array.isArray(value.sub), () => `Expected subtype as TypeDef[] in ${stringify(value)}`);
 
@@ -142,7 +131,7 @@ const infoMapping: Record<TypeDefInfo, (registry: Registry, value: TypeDef) => C
 
   // eslint-disable-next-line @typescript-eslint/no-unused-vars
   [TypeDefInfo.Null]: (registry: Registry, _: TypeDef): Constructor =>
-    createClass(registry, 'Null'),
+    Null,
 
   [TypeDefInfo.Option]: (registry: Registry, value: TypeDef): Constructor =>
     Option.with(getSubType(value)),
@@ -171,7 +160,7 @@ const infoMapping: Record<TypeDefInfo, (registry: Registry, value: TypeDef) => C
   },
 
   [TypeDefInfo.Si]: (registry: Registry, value: TypeDef): Constructor =>
-    getTypeClass(registry, registry.lookup.getTypeDef(value.index as number)),
+    getTypeClass(registry, registry.lookup.getTypeDef(value.type)),
 
   [TypeDefInfo.Struct]: (registry: Registry, value: TypeDef): Constructor =>
     Struct.with(getTypeClassMap(value), value.alias),
@@ -183,11 +172,11 @@ const infoMapping: Record<TypeDefInfo, (registry: Registry, value: TypeDef) => C
     createInt(value, UInt),
 
   [TypeDefInfo.Vec]: (registry: Registry, value: TypeDef): Constructor => {
-    const subType = expandLookup(registry, getSubType(value));
+    const subType = getSubType(value);
 
     return (
       subType === 'u8'
-        ? createClass(registry, 'Bytes')
+        ? Bytes
         : Vec.with(subType)
     );
   },
@@ -195,7 +184,7 @@ const infoMapping: Record<TypeDefInfo, (registry: Registry, value: TypeDef) => C
   [TypeDefInfo.VecFixed]: (registry: Registry, { displayName, length, sub }: TypeDef): Constructor => {
     assert(isNumber(length) && !isUndefined(sub), 'Expected length & type information for fixed vector');
 
-    const subType = expandLookup(registry, (sub as TypeDef).type);
+    const subType = (sub as TypeDef).type as keyof InterfaceTypes;
 
     return (
       subType === 'u8'
@@ -206,25 +195,27 @@ const infoMapping: Record<TypeDefInfo, (registry: Registry, value: TypeDef) => C
 };
 
 // Returns the type Class for construction
-export function getTypeClass<T extends Codec = Codec> (registry: Registry, value: TypeDef): Constructor<T> {
-  let Type = registry.get<T>(value.type);
+export function getTypeClass<T extends Codec = Codec> (registry: Registry, typeDef: TypeDef): Constructor<T> {
+  let Type = registry.get<T>(typeDef.type);
 
   if (Type) {
     return Type;
   }
 
-  const getFn = infoMapping[value.info];
+  try {
+    Type = infoMapping[typeDef.info](registry, typeDef) as Constructor<T>;
 
-  assert(getFn, () => `Unable to construct class from ${stringify(value)}`);
+    assert(Type, 'No class created');
 
-  Type = getFn(registry, value) as Constructor<T>;
+    // don't clobber any existing
+    if (!Type.__fallbackType && typeDef.fallbackType) {
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore ...this is the only place we we actually assign this...
+      Type.__fallbackType = typeDef.fallbackType;
+    }
 
-  // don't clobber any existing
-  if (!Type.__fallbackType && value.fallbackType) {
-    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
-    // @ts-ignore ...this is the only place we we actually assign this...
-    Type.__fallbackType = value.fallbackType;
+    return Type;
+  } catch (error) {
+    throw new Error(`Unable to construct class from ${stringify(typeDef)}: ${(error as Error).message}`);
   }
-
-  return Type;
 }
diff --git a/packages/types/src/create/types.ts b/packages/types/src/create/types.ts
index cef1359844..cbd3ce539c 100644
--- a/packages/types/src/create/types.ts
+++ b/packages/types/src/create/types.ts
@@ -36,6 +36,7 @@ export interface TypeDef {
   displayName?: string;
   fallbackType?: string;
   info: TypeDefInfo;
+  isFromSi?: boolean;
   index?: number;
   length?: number;
   name?: string;
diff --git a/packages/types/src/generic/PortableRegistry.ts b/packages/types/src/generic/PortableRegistry.ts
index deee6e88a0..4f842e5030 100644
--- a/packages/types/src/generic/PortableRegistry.ts
+++ b/packages/types/src/generic/PortableRegistry.ts
@@ -4,11 +4,13 @@
 import type { Vec } from '../codec/Vec';
 import type { PortableType } from '../interfaces/metadata';
 import type { SiField, SiLookupTypeId, SiType, SiTypeDefArray, SiTypeDefCompact, SiTypeDefComposite, SiTypeDefSequence, SiTypeDefTuple, SiTypeDefVariant, SiVariant } from '../interfaces/scaleInfo';
+import type { Type } from '../primitive/Type';
 import type { Registry, TypeDef } from '../types';
 
 import { assert, isNumber, isString, stringCamelCase, stringify } from '@polkadot/util';
 
 import { Struct } from '../codec/Struct';
+import { withTypeString } from '../create/encodeTypes';
 import { getTypeDef } from '../create/getTypeDef';
 import { TypeDefInfo } from '../types';
 
@@ -62,17 +64,33 @@ export class GenericPortableRegistry extends Struct {
     const index = this.#getLookupId(lookupId);
 
     if (!this.#typeDefs[index]) {
-      this.#typeDefs[index] = this.#extract(this.getSiType(lookupId), index);
+      // we set first since we will get into circular lookups along the way
+      this.#typeDefs[index] = {
+        info: TypeDefInfo.DoNotConstruct,
+        type: this.registry.createLookupType(index)
+      };
+
+      const typeDef = this.#extract(this.getSiType(lookupId), index);
+
+      Object.keys(typeDef).forEach((key): void => {
+        // these are safe since we are looking through the keys as set
+        this.#typeDefs[index][key as 'info'] = typeDef[key as 'info'];
+      });
     }
 
     return this.#typeDefs[index];
   }
 
-  #createSiDef (type: SiLookupTypeId): TypeDef {
-    return {
-      info: TypeDefInfo.Si,
-      type: this.registry.createLookupType(type)
-    };
+  #createSiDef (lookupId: SiLookupTypeId): TypeDef {
+    const typeDef = this.getTypeDef(lookupId);
+
+    // Flatten Plain types immediately, otherwise setup for a lookup
+    return typeDef.info === TypeDefInfo.Plain
+      ? typeDef
+      : {
+        info: TypeDefInfo.Si,
+        type: this.registry.createLookupType(lookupId)
+      };
   }
 
   #getLookupId (lookupId: SiLookupTypeId | string | number): number {
@@ -112,7 +130,7 @@ export class GenericPortableRegistry extends Struct {
       } else if (type.def.isComposite) {
         typeDef = this.#extractComposite(lookupIndex, type.def.asComposite);
       } else if (type.def.isHistoricMetaCompat) {
-        typeDef = getTypeDef(type.def.asHistoricMetaCompat);
+        typeDef = this.#extractHistoric(lookupIndex, type.def.asHistoricMetaCompat);
       } else if (type.def.isPrimitive) {
         typeDef = this.#extractPrimitive(lookupIndex, type);
       } else if (type.def.isSequence) {
@@ -143,30 +161,28 @@ export class GenericPortableRegistry extends Struct {
     };
   }
 
-  #extractArray (lookupIndex: number, { len: length, type }: SiTypeDefArray): TypeDef {
+  #extractArray (_: number, { len: length, type }: SiTypeDefArray): TypeDef {
     assert(!length || length.toNumber() <= 256, 'PortableRegistry: Only support for [Type; <length>], where length <= 256');
 
-    return {
+    return withTypeString(this.registry, {
       info: TypeDefInfo.VecFixed,
       length: length.toNumber(),
-      sub: this.#createSiDef(type),
-      type: this.registry.createLookupType(lookupIndex)
-    };
+      sub: this.#createSiDef(type)
+    });
   }
 
-  #extractCompact (lookupIndex: number, { type }: SiTypeDefCompact): TypeDef {
-    return {
+  #extractCompact (_: number, { type }: SiTypeDefCompact): TypeDef {
+    return withTypeString(this.registry, {
       info: TypeDefInfo.Compact,
-      sub: this.#createSiDef(type),
-      type: this.registry.createLookupType(lookupIndex)
-    };
+      sub: this.#createSiDef(type)
+    });
   }
 
   #extractComposite (lookupIndex: number, { fields }: SiTypeDefComposite): TypeDef {
     return this.#extractFields(lookupIndex, fields);
   }
 
-  #extractFields (lookupIndex: number, fields: SiField[]): TypeDef {
+  #extractFields (_: number, fields: SiField[]): TypeDef {
     const [isStruct, isTuple] = fields.reduce(([isAllNamed, isAllUnnamed], { name }) => ([
       isAllNamed && name.isSome,
       isAllUnnamed && name.isNone
@@ -175,21 +191,19 @@ export class GenericPortableRegistry extends Struct {
 
     assert(isTuple || isStruct, 'PortableRegistry: Invalid fields type detected, expected either Tuple or Struct');
 
-    if (isTuple) {
-      if (fields.length === 0) {
-        return {
-          info: TypeDefInfo.Null,
-          type: 'Null'
-        };
-      } else if (fields.length === 1) {
-        return {
-          ...this.#createSiDef(fields[0].type),
-          ...(fields[0].name.isSome
-            ? { name: stringCamelCase(fields[0].name.unwrap()) }
-            : {}
-          )
-        };
-      }
+    if (fields.length === 0) {
+      return {
+        info: TypeDefInfo.Null,
+        type: 'Null'
+      };
+    } else if (isTuple && fields.length === 1) {
+      return {
+        ...this.#createSiDef(fields[0].type),
+        ...(fields[0].name.isSome
+          ? { name: stringCamelCase(fields[0].name.unwrap()) }
+          : {}
+        )
+      };
     }
 
     const sub = fields.map(({ name, type }) => ({
@@ -200,16 +214,21 @@ export class GenericPortableRegistry extends Struct {
       )
     }));
 
-    return {
+    return withTypeString(this.registry, {
       info: isTuple // Tuple check first
         ? TypeDefInfo.Tuple
         : TypeDefInfo.Struct,
-      sub,
-      type: `(${sub.map(({ type }) => type).join(',')})`
-    };
+      sub
+    });
   }
 
-  #extractPrimitive (lookupIndex: number, type: SiType): TypeDef {
+  #extractHistoric (_: number, type: Type): TypeDef {
+    const inner = getTypeDef(type);
+
+    return { ...inner, displayName: type.toString(), isFromSi: true };
+  }
+
+  #extractPrimitive (_: number, type: SiType): TypeDef {
     const typeStr = type.def.asPrimitive.type.toString();
 
     return {
@@ -218,68 +237,89 @@ export class GenericPortableRegistry extends Struct {
     };
   }
 
-  #extractPrimitivePath (lookupIndex: number, type: SiType): TypeDef {
+  #extractPrimitivePath (_: number, type: SiType): TypeDef {
     return {
       info: TypeDefInfo.Plain,
       type: type.path[type.path.length - 1].toString()
     };
   }
 
-  #extractSequence (lookupIndex: number, { type }: SiTypeDefSequence): TypeDef {
-    return {
+  #extractSequence (_: number, { type }: SiTypeDefSequence): TypeDef {
+    const sub = this.#createSiDef(type);
+
+    return withTypeString(this.registry, {
       info: TypeDefInfo.Vec,
-      sub: this.#createSiDef(type),
-      type: this.registry.createLookupType(lookupIndex)
-    };
+      sub
+    });
   }
 
-  #extractTuple (lookupIndex: number, ids: SiTypeDefTuple): TypeDef {
-    return ids.length === 1
-      ? this.getTypeDef(ids[0])
-      : {
-        info: TypeDefInfo.Tuple,
-        sub: ids.map((type) => this.#createSiDef(type)),
-        type: this.registry.createLookupType(lookupIndex)
-      };
+  #extractTuple (_: number, ids: SiTypeDefTuple): TypeDef {
+    if (ids.length === 1) {
+      return this.getTypeDef(ids[0]);
+    }
+
+    const sub = ids.map((type) => this.#createSiDef(type));
+
+    return withTypeString(this.registry, {
+      info: TypeDefInfo.Tuple,
+      sub
+    });
   }
 
   #extractVariant (lookupIndex: number, { params, path }: SiType, { variants }: SiTypeDefVariant): TypeDef {
     const specialVariant = path[0].toString();
 
-    return specialVariant === 'Option'
-      ? {
+    if (specialVariant === 'Option') {
+      return withTypeString(this.registry, {
         info: TypeDefInfo.Option,
-        sub: this.#createSiDef(params[0].type.unwrap()),
-        type: this.registry.createLookupType(lookupIndex)
-      }
-      : specialVariant === 'Result'
-        ? {
-          info: TypeDefInfo.Result,
-          sub: params.map((p, index) => ({
-            name: ['Ok', 'Error'][index],
-            ...this.#createSiDef(p.type.unwrap())
-          })),
-          type: this.registry.createLookupType(lookupIndex)
-        }
-        : {
-          info: TypeDefInfo.Enum,
-          sub: this.#extractVariantSub(lookupIndex, variants),
-          type: this.registry.createLookupType(lookupIndex)
-        };
+        sub: this.#createSiDef(params[0].type.unwrap())
+      });
+    } else if (specialVariant === 'Result') {
+      return withTypeString(this.registry, {
+        info: TypeDefInfo.Result,
+        sub: params.map((p) => this.#createSiDef(p.type.unwrap())).map((def, index) => ({
+          name: ['Ok', 'Error'][index],
+          ...def
+        }))
+      });
+    } else if (variants.length === 0) {
+      return {
+        info: TypeDefInfo.Null,
+        type: 'Null'
+      };
+    }
+
+    return this.#extractVariantEnum(lookupIndex, variants);
   }
 
-  #extractVariantSub (lookupIndex: number, variants: SiVariant[]): TypeDef[] {
-    return variants.every(({ fields }) => fields.length === 0)
-      ? variants.map(({ index, name }) => ({
-        index: index.toNumber(),
-        info: TypeDefInfo.Plain,
-        name: name.toString(),
-        type: 'Null'
-      }))
-      : variants.map(({ fields, index, name }) => ({
-        ...this.#extractFields(lookupIndex, fields),
-        index: index.toNumber(),
-        name: name.toString()
-      }));
+  #extractVariantEnum (lookupIndex: number, variants: SiVariant[]): TypeDef {
+    const sub: (TypeDef & { name: string })[] = [];
+
+    // we may get entries out of order, arrange them first before creating with gaps filled
+    variants
+      .sort((a, b) => a.index.cmp(b.index))
+      .forEach(({ fields, index, name }) => {
+        const desired = index.toNumber();
+
+        while (sub.length !== desired) {
+          sub.push({
+            index: sub.length,
+            info: TypeDefInfo.Null,
+            name: `Unused${sub.length}`,
+            type: 'Null'
+          });
+        }
+
+        sub.push({
+          ...this.#extractFields(lookupIndex, fields),
+          index: index.toNumber(),
+          name: name.toString()
+        });
+      });
+
+    return withTypeString(this.registry, {
+      info: TypeDefInfo.Enum,
+      sub
+    });
   }
 }
diff --git a/yarn.lock b/yarn.lock
index d45b59a593..3de44676be 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1869,7 +1869,7 @@ __metadata:
     "@babel/runtime": ^7.14.6
     "@polkadot/api": 5.1.2-7
     "@polkadot/types": 5.1.2-7
-    "@polkadot/util": ^7.0.2
+    "@polkadot/util": ^7.0.3-0
     rxjs: ^7.2.0
   languageName: unknown
   linkType: soft
@@ -1880,12 +1880,12 @@ __metadata:
   dependencies:
     "@babel/runtime": ^7.14.6
     "@polkadot/api": 5.1.2-7
-    "@polkadot/keyring": ^7.0.2
+    "@polkadot/keyring": ^7.0.3-0
     "@polkadot/rpc-core": 5.1.2-7
     "@polkadot/rpc-provider": 5.1.2-7
     "@polkadot/types": 5.1.2-7
-    "@polkadot/util": ^7.0.2
-    "@polkadot/util-crypto": ^7.0.2
+    "@polkadot/util": ^7.0.3-0
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