On 6 December 2016 at 01:28, <p...@pwjw.com> wrote:
>
> And the error messages are not good.
>
> So I was wondering: Is this a philosophical thing? Or is it an effort
> thing? And if it is an effort thing, is there some sort of plan for what
> effort to put in? And if so, can I help by closing tickets?
>

This is an issue that's been discussed often.

The fundamental problem is that in a dynamically typed language, good error
messages are often at odds with runtime performance. The more checks we add
to catch specific scenarios, or to provide more descriptive scenarios, the
more performance tends to be impacted.

However, Clojure 1.9.0 may have a solution to that in the form of specs. We
can turn on specs selectively at development time, so we get the benefit of
detailed error messages, while in production we can turn them off for
performance.

- James

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