On Dec 10, 2012, at 1:38 PM, PJ Eby <pje@telecommunity.com> wrote:

Without numbers it's hard to say for certain, but the advantage to
keeping ordered dictionaries a distinct type is that the standard
dictionary type can then get that extra bit of speed in exchange for
dropping the ordering requirement.

I expect that dicts and OrderedDicts will remain separate 
for reasons of speed, space, and respect for people's mental models.


Raymond