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user_id=89016

I we had exception chaining (i.e. each exception can
reference another exception, that is the cause for this
one), this would just be a special case. A traceback could
then look like this:

>>> map(float, [0, 1, None, 3])
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: in entry None at position 2
Caused by:
TypeError: float() argument must be a string or a number