Adding attributes to a document in the view?

[Daniel DeLeo]

Is it possible in the newer versions to add attributes to a document object
in the view?  For example, on 0.8.0, if your view map function is:

function(doc) {
  doc.computed_attribute = 'hello, world';
  emit(doc._id, doc);
};

The view gives a 50X error, and a stack trace in futon.  Is it possible to
do this in any version of Couch?

Thanks,
Dan DeLeo