On Thu, Dec 16, 2010 at 12:24 PM, David Nolen <dnolen.li...@gmail.com> wrote:
> On Thu, Dec 16, 2010 at 12:06 PM, Ken Wesson <kwess...@gmail.com> wrote:
>>
>> The overflow check is the same whether you react to an overflow by
>> boxing the result or react to an overflow by throwing an exception!
>
> It's not the same at all.
> If you box the result all further arithmetic computations slows down. You
> cannot preserve the primitive path.

All further arithmetic computations slow down on the one hand; halt
with an exception if the opposite choice is made. Slow-but-works is
usually preferred to broken.

> However there are other breaking changes in 1.3 that have far greater
> implications for real Clojure apps than this change - like dynamic binding.
> This affects a much large range of Clojure apps, libraries and tools.

I don't know how common dynamic binding is in application code. It
tends to be in library code more often, which is a smaller number of
changes to make. Plus, the dynamic binding changes have a rationale
behind them that actually seems to me to make the tradeoff potentially
worth it.

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