fixup! lib,crypto: rewire CryptoKey on the native class

Author: panva

lib/internal/crypto/keys.js

@@ -897,9 +897,10 @@ const {
   return [CryptoKey, InternalCryptoKey];
 });
 
-// The helpers below return a CryptoKey's raw internal slot value,
+// The helpers below return a CryptoKey's internal slot value,
 // populating the per-instance cache on first access via a single
-// native call. The public `algorithm` / `usages` getters on
+// native call. The public `type` getter converts the native enum to
+// the Web Crypto string. The public `algorithm` / `usages` getters on
 // `CryptoKey.prototype` further clone their slot before returning.
 
 /**
@@ -908,7 +909,16 @@ const {
  * @returns {'secret' | 'public' | 'private'}
  */
 function getCryptoKeyType(key) {
-  return getSlots(key)[kSlotType];
+  switch (getSlots(key)[kSlotType]) {
+    case kKeyTypeSecret: return 'secret';
+    case kKeyTypePublic: return 'public';
+    case kKeyTypePrivate: return 'private';
+    default: {
+      // It is not possible to get here because all possible cases are handled above.
+      const assert = require('internal/assert');
+      assert.fail('Unreachable code');
+    }
+  }
 }
 
 /**