Hi Mark, On Mon, Sep 9, 2013 at 11:18 PM, Mark Shannon <mark@hotpy.org> wrote:

5. Other implementations. What do the Jython/IronPython/PyPy developers think?

Thanks for asking :-) I'm fine with staying out of language design issues like this one, and I believe it's the general concensus in PyPy. Whatever gets decided will probably be easy to port to PyPy and have no measurable performance impact: the extra checks on the type, if any, are all constant-folded by the JIT. A bientôt, Armin.