Enum .toJSON() to return type name as specified (#1811)

* Enum `.toJSON()` to return type name as specified

* Fix text compares

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

@@ -191,7 +191,7 @@ describe('Enum', (): void => {
     testDecode('Uint8Array', Uint8Array.from([0]), 'foo');
     testDecode('Uint8Array', Uint8Array.from([1]), 'bar');
 
-    testEncode('toJSON', 'bar');
+    testEncode('toJSON', 'Bar');
     testEncode('toNumber', 1);
     testEncode('toString', 'Bar');
     testEncode('toU8a', Uint8Array.from([1]));

packages/types/src/codec/Enum.ts

@@ -266,7 +266,7 @@ export default class Enum extends Base<Codec> {
    */
   public toJSON (): AnyJson {
     return this._isBasic
-      ? stringCamelCase(this.toString())
+      ? this.type
       : { [this.type]: this.raw.toJSON() };
   }
 

packages/types/src/codec/create/createType.spec.ts

@@ -47,7 +47,7 @@ describe('createType', (): void => {
   it('allows creation of a Enum (simple)', (): void => {
     expect(
       createTypeUnsafe(registry, '{"_enum": ["A", "B", "C"]}', [1]).toJSON()
-    ).toEqual('b');
+    ).toEqual('B');
   });
 
   it('allows creation of a Enum (parametrised)', (): void => {