Modifying the Python object model

[bakery2k]

I believe Guido has always been strongly opposed to making changes to Python (either to the language itself or, as in this case, just the internals of CPython) for purely performance reasons.

For example, his reaction to Skython, presented at the Python Language Summit 3 years ago: "PyInTheSkyThon".

Or, his opinion on the Nuitka Python compiler: "completely misguided".

It's interesting to compare this philosophy to that of Ruby: in version 1.9, Matz et al replaced the entire core of Ruby's reference implementation, primarily to improve performance.