I've been using Julia for my thesis research lately, and I find multiple dispatch to be a great match for writing mathematical algorithms, especially because of the ad-hoc specialization that it allows based on all parameter types. OO approaches always seemed weird for this sort of thing, where you'd have to decide which type "owns" the ability of how to work with the other types.

What I wish for:

- faster lambdas and which capture numbers as values not as addresses. I left Python over the latter, it caught me up all the time. At least Julia developers don't consider it a feature and plan to fix it.

- to be able to specify function domain and range types, for documentation and sanity checking

- maybe some improvements in comprehensions would be nice, so I could have an Array of Arrays of something e.g.. Currently the [x for...] comprehensions tend to collapse things together while the {x for ...} comprehensions tend to lose the types of what's inside.

Overall a great language already and a positive experience.