https://dl.acm.org/doi/pdf/10.1145/327649 https://dl.acm.org/doi/pdf/10.1145/327649 ("Julia: Dynamism and Performance Reconciled by Design") section 4.2.1 shows

https://dl.acm.org/doi/pdf/10.1145/327649 https://dl.acm.org/doi/pdf/10.1145/327649 ("Julia: Dynamism and Performance Reconciled by Design") section 4.2.1 shows how multiple dispatch enables a library to compute the derivative of another program without modifying that other program to be aware of the derivative-computing library.