I think the difference is that in Julia multiple dispatch is the main paradigm to structure code (together with very aggressive devirtualization/specialization/

I think the difference is that in Julia multiple dispatch is the main paradigm to structure code (together with very aggressive devirtualization/specialization/compilation). That enables quite amazing things. Other languages have multiple dispatch as well, but it is not foundational to the ecosystem in them. They lack the "magic" but they also have lower propensity for the interface mismatch bugs described through these two threads.