[bbrik]

As far as I know, it was implemented by Raymond Hettinger. This is a very interesting talk about the new tech:

https://www.youtube.com/watch?v=p33CVV29OG8&t=1202s

[lapink]

Indeed, here is the mail from Raymond Hettinger explaining the new design on the python-dev list: https://mail.python.org/pipermail/python-dev/2012-December/1... Quite amazing that it is faster, more memory efficient and convenient for the end user.

[brettcannon]

Raymond came up with the idea, PyPy implemented it, and then INADA Naoki implemented it for CPython.

[takeda]

If I remember correctly his talk. He went to CPython first and it was rejected, but PyPy welcomed it.

[masklinn]

It was proposed by Raymond Hettinger, but was actually first implemented by PHP and Pypy.