I've written a module that implements the base 85 encoding used by the old btoa program, and by PDFs as their Ascii85 encoding*
I'm not sure what to call it. It's functionally equivalent interface to MIME::Base64, but this isn't a MIME standard, so that's not the correct top level to live under. It is, arguably, an encoding module, but it isn't the interface of Encode, which is what modules under the Encode top level provide. So I'm not sure what to call it. Nicholas Clark * http://en.wikipedia.org/wiki/Ascii85
