Hey

I've been doing some work with ASTTransformer which is really useful. It
would be even more useful if it had something like this in the v method:

    when Sequel::Dataset
      opts = v( obj.send(:opts) )

      # preserve row_proc and other stuff
      dataset = obj.clone

      # reset opts after clone, because clone does a merge, so
      # opts which were removed by the transform process will
      # still be there in the new dataset.
      dataset.instance_variable_set '@opts', opts
      dataset

Reason being you can then pass a dataset instance into an ASTTransformer
subclass and get back another dataset. It will then also handle nested
datasets, ie datasets with a dataset as the value of the :from opt. I
beat my head on those two for a while... ;-)

ciao
John

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