What method do I overload to control display behavior in the workspace window?

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Sky Sartorius le 2 Nov 2017

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Modifié(e) : Sky Sartorius le 6 Nov 2017

When using a subclass of double (for example the ExtendDouble class from the documentation example ), an empty value has an error when displaying in the workspace window:

What is the method I have to overload (or other solution) to control this behavior and get the Value column to display either '0x0 ExtendDouble' or '[]'?