code: private function findAdderAndRemover()
      {
          $reflClass = new \ReflectionClass($this->class);
          $singulars = (array) StringUtil::singularify($this->camelize($this->name));
  
          foreach ($singulars as $singular) {
              $addMethod = 'add'.$singular;
              $removeMethod = 'remove'.$singular;
  
              $addMethodFound = $this->isAccessible($reflClass, $addMethod, 1);
              $removeMethodFound = $this->isAccessible($reflClass, $removeMethod, 1);
  
              if ($addMethodFound && $removeMethodFound) {
                  $this->adderRemover = $singular;
  
                  return;
              }
          }
      }
docs: Searches add and remove methods
  
  Simplified version of {@link Symfony\Component\PropertyAccess\PropertyAccessor}.