}' => array('foo' => 'bar', 'bar' => 'foo: bar'),              // nested sequences and mappings             '[foo, [bar, foo]]' => array('foo', array('bar', 'foo')),              '[foo, [bar, [foo, [bar, foo]], foo]]' => array('foo', array('bar', array('foo', array('bar', 'foo')), 'foo')),              '