In the original discussion, I think they decided to reimplement set before dict.
The original discussion is here, for anyone else: https://mail.python.org/pipermail/python-dev/2012-December/123028.html On Jun 18, 2016 3:15 AM, "INADA Naoki" <songofaca...@gmail.com> wrote: > If builtin dict in both of PyPy and CPython is ordered, many people > will relying it. > It will force other Python implementations to implement it for compatibility. > In other words, it may be de-facto "Python Language", even if Python > Language spec > say it's an implementation detail. > > Is it OK? Ordered, or just initially ordered? I mean, "ordered if no deletion". They discussed scrambling the order. (Subdiscussion was here: https://mail.python.org/pipermail/python-dev/2012-December/123041.html)
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