diff --git a/exercises/practice/sublist/.meta/proof.ci.js b/exercises/practice/sublist/.meta/proof.ci.js
index 10d49b49a7..51602fc813 100644
--- a/exercises/practice/sublist/.meta/proof.ci.js
+++ b/exercises/practice/sublist/.meta/proof.ci.js
@@ -13,7 +13,7 @@ export class List {
       other.items.length === 0 ||
       `,${this.items.join(',')},`.includes(`,${other.items.join(',')},`);
     return ['UNEQUAL', 'SUPERLIST', 'SUBLIST', 'EQUAL'][
-      +superlist + (+sublist << 1)
+      Number(superlist) + (Number(sublist) << 1)
     ];
   }
 }
diff --git a/exercises/practice/zipper/zipper.spec.js b/exercises/practice/zipper/zipper.spec.js
index 3d5007a09f..df71114441 100644
--- a/exercises/practice/zipper/zipper.spec.js
+++ b/exercises/practice/zipper/zipper.spec.js
@@ -50,7 +50,7 @@ describe('Zipper', () => {
     expect(zipper.left().up().right().up().left().right().value()).toEqual(3);
   });
 
-  xtest('test ability to descend multiple levels and return', () => {
+  xtest('ability to descend multiple levels and return', () => {
     expect(zipper.left().right().up().up().value()).toEqual(1);
   });