I think it's worth pointing out that someone who knows way more about Julia internals than I do (yuyichao) said this comment is wrong on several points on the [

I think it's worth pointing out that someone who knows way more about Julia internals than I do (yuyichao) said this comment is wrong on several points on the [Julia discourse](https://discourse.julialang.org/t/fortran-vs-julia-stack-allocated-arrays/18119 https://discourse.julialang.org/t/fortran-vs-julia-stack-all...). Highlights include that that "Stack allocation is a property of the object, mutability is a property of the type", and that mutable objects that do not escape a function are likely to avoid heap allocation (ie, try to avoid calling non-inline functions). Unfortunately, that can sometimes mean having to roll your own functions like `sum` and `dot_product`. A simple for loop is easy, but that some of these basic functions don't inline by default can make it a little more cumbersome.