[$] Modifying the Python object model

At the 2018 Python Language Summit, Carl Shapiro described some ofthe experiments that he and others at Instagram did to look at ways toimprove the performance of the CPython interpreter.The talk was somewhat academic in tone and built on what has been learnedin other dynamic languages over the years. By modifying the Python objectmodel fairly substantially, they were able to roughly double the performanceof the "classic" Richards benchmark.