Allow EnumType to decode isHex (#611)

* Allow EnumType to decode isHex

* Consistently use string (not String/string mix)

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

@@ -35,6 +35,15 @@ describe('Struct', () => {
     ).toEqual('some text value');
   });
 
+  it('decodes from hex', () => {
+    expect(
+      new EnumType(
+        { Text, U32 },
+        '0x0134120000'
+      ).value.toString()
+    ).toEqual('4660'); // 0x1234 in decimal
+  });
+
   it('decodes from a JSON input (mixed case)', () => {
     expect(
       new EnumType(

packages/types/src/codec/EnumType.ts

@@ -2,7 +2,7 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-import { assert, isNumber, isObject, isString, isU8a, u8aConcat, u8aToHex } from '@polkadot/util';
+import { assert, hexToU8a, isHex, isNumber, isObject, isString, isU8a, u8aConcat, u8aToHex } from '@polkadot/util';
 
 import Base from './Base';
 import Null from '../Null';
@@ -61,7 +61,11 @@ export default class EnumType<T> extends Base<Codec> implements Codec {
     } else if (isNumber(value)) {
       return EnumType.createValue(def, value);
     } else if (isString(value)) {
-      return EnumType.createViaJSON(def, value.toString());
+      const _str = value.toString();
+
+      return isHex(_str)
+        ? EnumType.decodeViaValue(def, hexToU8a(_str))
+        : EnumType.createViaJSON(def, _str);
     } else if (isObject(value)) {
       const key = Object.keys(value)[0];