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Some more comments:
(1) I don't think I understand the mechanism by which __lt__ and __le__ are supposed to 
be called. For example, by adding a few print statements it seems that the comparison
Decimal(2) > 3
doesn't call __lt__ at any stage. Is this what's expected, or is this unintended?
(2) Also on the subject of __le__ and __lt__: if Decimal is going to have rich 
comparisons (and I guess it is, one way or another :) ) then we might as well get them 
right for NaNs: IEEE-754(r) says that any comparison involving NaN should return False, 
with the exception of != which should always return True. With 3-way comparison it 
wasn't possible to get this right. This would fix Issue 1514428. (Further discussion of 
this should probably go there---I don't think it should hold up applying this patch...)
(3) I'm getting a serious performance hit from this patch: a complete run of 
test_decimal.py costs me 22.439 seconds (best of 3) with the patch, and 11.604 seconds 
without. I'm not sure where this is coming from---perhaps it's unavoidable.