Fair enough, but in this case types wouldn't really have helped: the author did 
use `Double` type hints, mistakenly assuming that would make its code use 
primitive types, which it does not since `Double` is boxed and not primitive.
Clojure already has compile time warnings about boxed math that would've helped 
in this case if turned on, without any need for types: try compiling OP's code 
after running `(set! *unchecked-math* :warn-on-boxed)`


> On 12 May 2016, at 23:05, Raoul Duke <rao...@gmail.com> wrote:
> 
> On Thu, May 12, 2016 at 2:59 PM, Nicola Mometto <brobro...@gmail.com> wrote:
>> Static types wouln't have helped at all in this case. Types are about 
>> correctness, not performances. This comment was needless
> 
> Here I thought maybe knowing when something was or was not something
> could have been useful in, you know, making the code (benchmarks in
> this case) actually do what the author wanted it to be doing. Silly
> me.
> 
> I will always have my fingers crossed for core.typed. :-)
> 
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