I have created a prototype of PEP 245 based on the Mobius Python library. This prototype requires no changes to Python 2.x.
I have also updated PEP 245 to reflect using the prototype. Refer to the 'doc' directory for the revised PEP. The prototype can be downloaded from:
It contains four directories and a README that should get you started. Please follow up any comments specific to the PEP onto the email@example.com list.