I've been doing some work with some of the symmetric Filters - especially
encryption and urlencoding.  What I've come up with is a more 'formal' class
which encompasses and encoder and a decoder.  

The idea is that the same Zend_Encoder based class should be just an
identity to the value passed in.

(given scalar $x, $params to Crypt;)
$enc = new Zend_Encoder_Crypt($params);
$y1 = $enc->encode($x);
$y2 = $enc->decode($y1);
assert($x === $y);

An Encoder could easily be just a composition of Filter objects.

Encoder chaining would run encode() in the order specified in the chain, but
decode() would run in reverse order.

$enc->addEncoder(Zend_Encoder_Base64)
$enc->addEncoder(Zend_Encoder_UrlEncode);
$enc->encode(); // runs Base64->encode(); UrlEncode->encode();
$enc->decode(); // runs UrlEncode->decode(); Base64->decode();

Is this a valuable class?  If so, I'll happily put together the proposal and
start up some basic implementations.
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