Ensure large >U32 is encoded as hex (#641)

* Ensure large >U32 is enocoded as hex

* Update U64 test compares to hex

* Update subscribe.spec.ts

packages/rpc-provider/src/mock/subscribe.spec.ts

@@ -39,7 +39,7 @@ describe('subscribe', () => {
 
   it('calls back with new headers', (done) => {
     return mock.subscribe('chain_newHead', 'chain_subscribeNewHead', (_: any, header: any) => {
-      if (header.number === 4) {
+      if (header.number === '0x0000000000000004') {
         done();
       }
     });
@@ -55,7 +55,7 @@ describe('subscribe', () => {
         throw new Error('testing');
       }
 
-      if (header.number === 3) {
+      if (header.number === '0x0000000000000003') {
         done();
       }
     });

packages/types/src/Digest.spec.ts

@@ -15,7 +15,7 @@ describe('Digest', () => {
 
     expect(log.type).toBe('Seal');
     expect(log.value.toJSON()).toEqual([
-      256804359,
+      '0x000000000f4e8607',
       '0x2c0e0ee8a5d1a073da3f8db002b8eaebcd7b1a7eb25662e09f9ef0ac58d96bf17896256cd5f0bc672f96aab49fe5163ca5cb4c1a0f047dc39e89cd4a9eb2ea05'
     ]);
   });

packages/types/src/I128.ts

@@ -13,6 +13,6 @@ import Int from './codec/Int';
  */
 export default class I128 extends Int {
   constructor (value?: AnyNumber) {
-    super(value, 128, false);
+    super(value, 128, true);
   }
 }

packages/types/src/I256.ts

@@ -13,6 +13,6 @@ import Int from './codec/Int';
  */
 export default class I256 extends Int {
   constructor (value?: AnyNumber) {
-    super(value, 256, false);
+    super(value, 256, true);
   }
 }

packages/types/src/I64.ts

@@ -13,6 +13,6 @@ import Int from './codec/Int';
  */
 export default class I64 extends Int {
   constructor (value?: AnyNumber) {
-    super(value, 64, false);
+    super(value, 64, true);
   }
 }

packages/types/src/U128.ts

@@ -13,6 +13,6 @@ import UInt from './codec/UInt';
  */
 export default class U128 extends UInt {
   constructor (value?: AnyNumber) {
-    super(value, 128);
+    super(value, 128, true);
   }
 }

packages/types/src/U256.ts

@@ -13,6 +13,6 @@ import UInt from './codec/UInt';
  */
 export default class U256 extends UInt {
   constructor (value?: AnyNumber) {
-    super(value, 256);
+    super(value, 256, true);
   }
 }

packages/types/src/U64.ts

@@ -13,6 +13,6 @@ import UInt from './codec/UInt';
  */
 export default class U64 extends UInt {
   constructor (value?: AnyNumber) {
-    super(value, 64, false);
+    super(value, 64, true);
   }
 }

packages/types/src/codec/Struct.spec.ts

@@ -3,7 +3,9 @@
 // of the Apache-2.0 license. See the LICENSE file for details.
 
 import { CodecTo } from '../types';
+import Option from './Option';
 import Struct from './Struct';
+import BlockNumber from '../BlockNumber';
 import Text from '../Text';
 import U32 from '../U32';
 import Vector from './Vector';
@@ -172,4 +174,13 @@ describe('Struct', () => {
       ).toBe(true);
     });
   });
+
+  it('allows toString with large numbers', () => {
+    // replicate https://github.com/polkadot-js/api/issues/640
+    expect(
+      new Struct({
+        blockNumber: Option.with(BlockNumber)
+      }, { blockNumber: '0x1234567890abcdef' }).toString()
+    ).toEqual('{"blockNumber":"0x1234567890abcdef"}');
+  });
 });