Martin,

I'm returning to this after a pause as well...  Suppose I have a subclass of dict.  When dumping with
my proposed patch it will get dumped as a list.  If it is to be dumped as some lowest common
denominator type, it should be a dict I think.  For example:

#!/usr/bin/env python

class D(dict):
    pass

d = D(x=1, y=2, z=3)
print d
print list(d)

Until we address is case (at least) I'm un-accepting the patch...

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