accept only array

src/Illuminate/Database/Eloquent/Model.php

@@ -437,12 +437,11 @@ public function qualifyColumn($column)
     /**
      * Qualify the column's lists name by the model's table.
      *
-     * @param  array|mixed  $columns
+     * @param  array  $columns
      * @return array
      */
     public function qualifyColumns($columns)
     {
-        $columns = is_array($columns) ? $columns : func_get_args();
         $qualifiedArray = [];
 
         foreach ($columns as $column) {

tests/Database/DatabaseEloquentBuilderTest.php

@@ -203,7 +203,6 @@ public function testQualifyColumns()
 
         $builder->setModel(new EloquentModelStub);
 
-        $this->assertEquals(['stub.column', 'stub.name'], $builder->qualifyColumns('column', 'name'));
         $this->assertEquals(['stub.column', 'stub.name'], $builder->qualifyColumns(['column', 'name']));
     }