Align fromHex in AbstractInt with toHex (and with actual BE JSON) (#571)

* Align fromHex in AbstractInt with toHex (and with actual BE JSON)

* Update test (hex input in BE)

packages/types/src/codec/AbstractInt.ts

@@ -39,7 +39,7 @@ export default abstract class AbstractInt extends BN implements Codec {
     // constructor. It would be ideal to actually return a BN, but there's a
     // bug: https://github.com/indutny/bn.js/issues/206.
     if (isHex(value)) {
-      return hexToBn(value, { isLe: true, isNegative }).toString();
+      return hexToBn(value, { isLe: false, isNegative }).toString();
     } else if (isU8a(value)) {
       try {
         // NOTE When passing u8a in (typically from decoded data), it is always LE

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

@@ -63,7 +63,7 @@ describe('Compact', () => {
 
     it('encondes a large balance', () => {
       expect(
-        Compact.encodeU8a(new Balance('0x00407a10f35a'))
+        Compact.encodeU8a(new Balance('0x5af3107a4000'))
       ).toEqual(
         new Uint8Array([
           3 + ((6 - 4) << 2),