Types with multiple supertypes

General Usage
4

I would use multiple dispatch passing both model types as variables. Example:

abstract type LetterModel end
abstract type NumberModel end

struct A <: LetterModel
struct Num1 <: NumberModel

f(letter::LetterModel, number::NumberModel) # generic implementation
f(letter::A, number::NumberModel) # uses A, but ignores Number
f(letter::B, number::Num2) # Specialized method on both B and 2
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