Set.php
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	<?php

	class Stripe_Util_Set
	{
	private $_elts;

	public function __construct($members=array())
	{
	$this->_elts = array();
	foreach ($members as $item)
	$this->_elts[$item] = true;
	}

	public function includes($elt)
	{
	return isset($this->_elts[$elt]);
	}

	public function add($elt)
	{
	$this->_elts[$elt] = true;
	}

	public function discard($elt)
	{
	unset($this->_elts[$elt]);
	}

	// TODO: make Set support foreach
	public function toArray()
	{
	return array_keys($this->_elts);
	}
	}