diff --git a/packages/primitives/src/primitives/cache.js b/packages/primitives/src/primitives/cache.js
index 5e7c89b0..f2fc5c4b 100644
--- a/packages/primitives/src/primitives/cache.js
+++ b/packages/primitives/src/primitives/cache.js
@@ -221,59 +221,19 @@ export function createCaches() {
   return { Cache, cacheStorage }
 }
 
-function CacheStorage() {
-  if (!(this instanceof CacheStorage)) return new CacheStorage()
-  throw TypeError('Illegal constructor')
-}
-
-function CacheStorageToString() {
-  return 'function CacheStorage() { [native code] }'
-}
-
-Object.defineProperty(CacheStorageToString, 'name', {
-  configurable: true,
-  enumerable: false,
-  value: 'toString() { [native code] }',
-  writable: true,
-})
-
-Object.defineProperty(CacheStorage, 'toString', {
-  configurable: true,
-  enumerable: false,
-  value: CacheStorageToString,
-  writable: true,
-})
-
-/**
- * @type Cache
- */
-function Cache() {
+export function Cache() {
   if (!(this instanceof Cache)) return new Cache()
   throw TypeError('Illegal constructor')
 }
 
-function CacheToString() {
-  return 'function Cache() { [native code] }'
+export function CacheStorage() {
+  if (!(this instanceof CacheStorage)) return new CacheStorage()
+  throw TypeError('Illegal constructor')
 }
 
-Object.defineProperty(CacheToString, 'name', {
-  configurable: true,
-  enumerable: false,
-  value: 'toString() { [native code] }',
-  writable: true,
-})
-
-Object.defineProperty(Cache, 'toString', {
-  configurable: true,
-  enumerable: false,
-  value: CacheToString,
-  writable: true,
-})
-
-const cachesStorage = createCaches()
-const CacheFromStorage = cachesStorage.Cache
-
-export const caches = cachesStorage.cacheStorage()
-
-export { CacheStorage }
-export { CacheFromStorage as Cache }
+export const caches = (() => {
+  const { cacheStorage } = createCaches()
+  const caches = cacheStorage()
+  caches.open('default')
+  return caches
+})()
diff --git a/packages/primitives/src/primitives/crypto.js b/packages/primitives/src/primitives/crypto.js
index d5caac79..c412ad53 100644
--- a/packages/primitives/src/primitives/crypto.js
+++ b/packages/primitives/src/primitives/crypto.js
@@ -16,24 +16,6 @@ function SubtleCrypto() {
   throw TypeError('Illegal constructor')
 }
 
-function SubtleCryptoToString() {
-  return 'function SubtleCrypto() { [native code] }'
-}
-
-Object.defineProperty(SubtleCryptoToString, 'name', {
-  configurable: true,
-  enumerable: false,
-  value: 'toString() { [native code] }',
-  writable: true,
-})
-
-Object.defineProperty(SubtleCrypto, 'toString', {
-  configurable: true,
-  enumerable: false,
-  value: SubtleCryptoToString,
-  writable: true,
-})
-
 export const crypto = new Crypto()
 
 export { Crypto }
diff --git a/packages/primitives/tests/cache.test.ts b/packages/primitives/tests/cache.test.ts
index 7aa9bcc8..66c268b3 100644
--- a/packages/primitives/tests/cache.test.ts
+++ b/packages/primitives/tests/cache.test.ts
@@ -1,8 +1,39 @@
 import { fetch, Request, Response } from '../fetch'
-import { createCaches } from '../cache'
+import {
+  caches,
+  createCaches,
+  Cache as ICache,
+  CacheStorage as ICacheStorage,
+} from '../cache'
 
 const { cacheStorage, Cache } = createCaches()
 
+test('Cache is an interface', () => {
+  expect.assertions(2)
+
+  try {
+    new ICache()
+  } catch (error: any) {
+    expect(error.name).toBe('TypeError')
+    expect(error.message).toBe('Illegal constructor')
+  }
+})
+
+test('CacheStorage is an interface', () => {
+  expect.assertions(2)
+
+  try {
+    new ICacheStorage()
+  } catch (error: any) {
+    expect(error.name).toBe('TypeError')
+    expect(error.message).toBe('Illegal constructor')
+  }
+})
+
+test('the default caches object has a default namespace', async () => {
+  expect(Array.from(await caches.keys())).toEqual(['default'])
+})
+
 test('caches.open', async () => {
   const caches = cacheStorage()
   const cache = await caches.open('my_cache')