public function testWithoutValue()
{
$this->assertArrayHasKey('one', $this->struct);
$copy = $this->struct->withoutValue('one');
$this->assertNotSame($this->struct, $copy);
$this->assertArrayNotHasKey('one', $copy);
// Removing the a non-exisistant value should not copy
$another = $copy->withoutValue('one');
$this->assertSame($copy, $another);
}
