Hey Reid, 

I've forwarded this over to Rich and Stu to take a look at.

Alex

On Thursday, August 6, 2015 at 11:46:09 AM UTC-5, Reid McKenzie wrote:
>
> Hello all,
>
> Alan Malloy and I recently implemented[1] and contributed[2] an opt-in
> strict tags mode to Alexander Yakushev's Skummet compiler. To
> summarize the linked blog post and merge request, we created the
> `clojure.core/*strict-tags*` dynamic var which may either be set by
> users at the namespace level a la `clojure.core/*warn-on-reflection*`
> or set on a per-fn basis with the `^:strict` metadata annotation. When
> in strict mode, type hints are interpreted not as optional and late
> checked hints (the Clojure default) but as eagerly checked static
> types on tagged locals and expressions.
>
> The effect of these changes is to greatly reduce the number of
> checkcast instructions emitted when performing tagged interop should
> users opt into using strict mode and accept the requisite
> responsibility for managing their types.
>
> While the odds that these changes will be accepted as-is are slim, we
> think they represent a valuable addition to the language and so
> present them for your consideration.
>
> - Reid
>
> [1] - http://blog.factual.com/strictly-tagged-clojure
> [2] - https://github.com/alexander-yakushev/clojure/pull/1
>
>

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