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Mark Summerfield wrote:

(Personally I've never needed an insertion-ordered dict.)

Then you've never programmed in PHP I take it. PHP's one-size-fits-all data structure is an insertion-ordered dict; PHP programmers use it everywhere a Python programmer might use a dict or a list. I've had one or two people tell me having both behaviors in one object is "really useful every-so-often", though they didn't go into any more detail. Can't really see the advantage, myself.

larry