The allowed series length for the number group of a product variant is 0.
why is it so? Any specific reason?
I have different models of product, and each model has different variants.Suppose if I need t catagorise the variants based on my model, how do I do?
Does that seems to be a valid need?

Product variant value is internally stored as a long value.
So to be shure that only numerics are used number series length has to be 0.

Andreas