Issue #17618 introduced base85 options into the base64 module including b85 and a85/adobe variants.

There has since been introduced a variant that is easier to work with specifically as it avoids " ' \ characters which avoids quoting/escaping issues when working with base85 literals in python, json, xml, etc.

https://rfc.zeromq.org/spec:32/Z85/

there is a reference implementation in c for which an extension could easily be built.

alternately it would be very easy to add a _z85alphabet etc. to the base64 module to mirror what has been done with a/b85.

1) is there any interest in this being in the language
2) if so do we want python impl or c extension around ref impl?