Hash.new(0) and the block form of Hash.new{_smart_stuff_}  come in
really handy while reading in a hash.
When the reading is done however, my hash serves to provide data. At
that stage, the default_value behaviour gets in the way. For instance,
if the hash contains the number of goals for soccerplayers, I don't want
the hash to return value "0" for the key "Wolfgang Amadeus Mozart"; by
then I want plain old Nil, or "No data available".

failed experiment:

Class Hash
  def default_proc
    Nil
  end
end

How can Hash.new behaviour be changed?

regards,
Siep
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