Support for custom variable types

[AayushSabharwal]

Could DynamicPolynomials allow inserting custom <: AbstractDynamicPolynomialsVariable{V, M} variable types? It seems like if an extensive interface for variables (on top of the one defined in MultivariatePolynomials) is defined this could easily be possible and make the package more extensible.

[blegat]

So you mean if a packages has some part that only works on DynamicPolynomials variables ? At the moment, there are no other so maybe you can use DynamicPolynomials.Variable directly ? It's not clear to me what the definition of that abstract type would be