Refactor method addAll

Author: makeey

spec/ArrayListSpec.php

@@ -203,6 +203,7 @@ function () {
                 $tmp_array_list->add('string2');
                 $this->arrayList->addAll($tmp_array_list);
                 expect($this->arrayList->isEmpty())->toEqual(false);
+                expect($this->arrayList->size())->toEqual(2);
                 expect($this->arrayList->get(0))->toEqual('string1');
                 expect($this->arrayList->get(1))->toEqual('string2');
             });

src/ArrayList.php

@@ -151,11 +151,8 @@ public function addAll(...$args): bool
                         return true;
                     }
                     $this->guardCollectionType($collection);
-                    foreach ($collection as $value) {
-                        $this->values[] = $value;
-                        $this->size++;
-
-                    }
+                    $this->values = \array_merge($this->values, $collection->toArray());
+                    $this->size += $collection->size();
                     return true;
                 },
                 "integer, {$typeCollection}" => function ($index, Collection $collection) {