Although it's necessary to consider that continues being necessary a
custom type to add a new argument (in this case is 'cost'). And I
prefer a custom type before that a subclass of Column for this one.

Now well, to get the another argument which is at instance-level
surely will be better make it thorught a descriptor, as you said.

On 22 dic, 09:37, Kless <jonas....@googlemail.com> wrote:
> Thank you. Your aid is incalculable as always.
> I'll use a descriptor for this case as you well advise.

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