fix(src) phpstan flagged issues

composer.json

@@ -20,5 +20,10 @@
   },
   "require-dev": {
     "phpunit/phpunit": "<10.0"
+  },
+  "config": {
+    "platform": {
+      "php": "7.1"
+    }
   }
 }

src/App.php

@@ -482,7 +482,7 @@ public static function callback($id, $method)
      */
     public static function instance($id, ?array $buildArgs = [], ?array $afterBuildMethods = null)
     {
-        return static::container()->instance($id, $buildArgs, $afterBuildMethods);
+        return static::container()->instance($id, $buildArgs ?? [], $afterBuildMethods);
     }
 
     /**

src/Container.php

@@ -459,6 +459,7 @@ public function register($serviceProviderClass, ...$alias)
             $provider->register();
         } else {
             $provided = $provider->provides();
+            // @phpstan-ignore-next-line
             if (!is_array($provided) || count($provided) === 0) {
                 throw new ContainerException(
                     "Service provider '{$serviceProviderClass}' is marked as deferred" .
@@ -748,13 +749,15 @@ public function callback($id, $method)
     {
         $callbackIdPrefix = is_object($id) ? spl_object_hash($id) : $id;
 
+        // @phpstan-ignore-next-line
         if (!is_string($callbackIdPrefix)) {
             $typeOfId = gettype($id);
             throw new ContainerException(
                 "Callbacks can only be built on ids, class names or objects; '{$typeOfId}' is neither."
             );
         }
 
+        // @phpstan-ignore-next-line
         if (!is_string($method)) {
             throw new ContainerException("Callbacks second argument must be a string method name.");
         }
@@ -878,6 +881,7 @@ public function getProvider($providerId)
      */
     public function isBound($id)
     {
+        // @phpstan-ignore-next-line
         return is_string($id) && $this->resolver->isBound($id);
     }