I can't really speak to what's more idiomatic, but there is a slight
difference between a top-level let and ^:const ^:private.
^:const makes the compiler directly inline the form, thus it works only on
pr-dup - able values. This has gotten me by surprise some times.
This also duplicates values, that would otherwise be referenced.

OTOH, a let compiles into a static field + regular access, also it's "more
private" in the sense that you can't even get it by the (rather obscure)
@#'private-var form
​
Personally, I think there is nothing wrong with top-level lets and I like
to use them, just to keep compiler writers honest. There had been a
clojurescript bug related to this once.
Also they are more explicit about scope than the reference tree implicit in
namespace vars.

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