Yes I usually use unqualified keys as the applicability of my operations widens

E.g. if I have a function that only operates on YouTube videos, then I’d rather talk about a YouTube video entity specifically (using namespaced keywords)

But if I take any number of kinds of videos, then your un-namespaced version with a “service” key is far better than checking to see if a bunch of namespaced keys are nil or not

might be interesting in those cases if you could used derived keywords for map access, i.e.:

(derive :youtube.video/title :media/title)

(:media/title {:youtube.video/title "Blah"}) 

I need to call a private constructor on a Java class instead of the provided factory method. What’s the easiest way to do this?

you can use reflection to make the private method accessible and call it

like how it's done here: https://stackoverflow.com/questions/880365/any-way-to-invoke-a-private-method

Yeah I tried that, but AFAICT there’s no way to get getDeclaredMethod to resolve constructors. Also, while there is getConstructors method, it can only be used for public constructors.

Does Clojure offer something like dynamic binding for multimethods? E.g.: https://gist.github.com/borkdude/e9d333b8e4fae210a36bafdd0bbfa3ab but then done via binding on the multimethod + dispatch value?

Another viable option in my case would be to inherit from the class and just replicate what the private constructor does (which is to set a few final fields). Is this doable?

Oh, apparently there’s a getDeclaredConstructor reflection method that can be used to access private constructors. I’ll just use that.

I just learned that clojure.core/- doesn't have a zero-arity like clojure.core/+ does. Does anyone have know of a JIRA ticket or somewhere else people have discussed this before? It's not easy to google for.

subtraction doesn't have an identity element like addition

Is there something like clojure.lang.ILookup that I can implement for an object to have (get my-object k) work on it?

I think you just answered your own question @isak

Ah it does work, my first test was broken. Thanks @joe.lane