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ImplicitTypedArray::NewInstance should return AOSDataArray

Nicolas Vuaille requested to merge nicolas.vuaille/vtk:ImplicitArrayNewInstance into master

ImplicitTypedArrays are the vtkImplicitArray (like vtkConstantArray) specialized classes generated at configure time for standard value types (e.g. vtkConstantIntArray).

As NewInstance is expected to produce a writable array, those classes should return a vtkAOSDataArrayTemplate of the same value type instead of a vtkImplicitArray.

For this exact purpose, there is a vtkImplicitArrayTypeMacro that should be used instead of the usual vtkTypeMacro.

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