Virtual Field Descriptions
Some fields including in the various Mappers don't rely on any actual field in
the Model (e.g., ListMapper::NAME_ACTIONS or ListMapper::NAME_BATCH).
In order to prevent any side-effects when trying to retrieve the value of this
field (which doesn't exist), the option virtual_field is specified for these
fields.
When the template is instantiated, or whenever the value of the field is
required, null will be returned without prying on the Model itself.
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