Add proper return type to OptimizelyUserContext::jsonSerialize

The following indirect deprecation notice is popping up when calling OptimizelyUserContext::jsonSerialize in php 8+: 1x: Method "JsonSerializable::jsonSerialize()" might add "mixed" as a native return type declaration in the future. Do the same in implementation "Optimizely\OptimizelyUserContext" now to avoid errors or add an explicit @return annotation to suppress this message.
optimizely · samybasset · Jun 14, 2022 · Jun 14, 2022 · a7d4eaa05749965d5982028bfe58686206b62f2e
commit a7d4eaa05749965d5982028bfe58686206b62f2e
diff --git a/src/Optimizely/OptimizelyUserContext.php b/src/Optimizely/OptimizelyUserContext.php
@@ -147,6 +147,9 @@ public function getOptimizely()
         return $this->optimizelyClient;
     }
 
+    /**
+     * @return mixed
+     */
     #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {