<commit_before><?php
namespace GraphCommons\Graph;

use GraphCommons\Util\Collection;
use GraphCommons\Graph\Signal;

class Signals extends Collection
{
    final public function add(Signal $signal)
    {
        return parent::set($this->count(), $signal);
    }
}<commit_msg>modify add() method.<commit_after><?php
namespace GraphCommons\Graph;

use GraphCommons\Util\Collection;
use GraphCommons\Graph\Signal;

class Signals extends Collection
{
    final public function add(Signal $signal): self
    {
        parent::set($this->count(), $signal);

        return $this;
    }
}
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