If there's a technical reason why Clojure can't return false for all =
comparisons between floats and doubles, I'd like to hear it. Otherwise, I don't
see how your response is relevant.
> On Jan 23, 2015, at 3:10 AM, Luc Prefontaine <lprefonta...@softaddicts.ca>
> wrote:
>
> Agree, it's broken... in java...
> Has it has been broken in the past in several architectures...
>
> I understand your frustration but this is not something new. It's been a
> problem for at least 30 years.
>
> It is kind of a basic programming issue:
>
> - Never compare floats with different representations.
>
> - Never mix different representations in computations
>
> - Convert representations as early as possible to a common format
>
> These are the rules to follow to avoid running into trouble.
>
> Now if you think you can overcome this persistent (ah ! ah !) problem with
> some David Copperfield trick, fine.
>
> But that's a trick nothing else. The problem will resurface in some form in
> another. Better cope with reality...
>
> Luc P.
>
>
>> On Jan 23, 2015, at 1:33 AM, Immo Heikkinen <immo.heikki...@gmail.com> wrote:
>>>
>>> I actually ran into this while comparing nested data structures from two
>>> different sources and spent a good part of my day figuring out what's
>>> happening. While it is a good advice to avoid mixing floats and doubles, it
>>> is inevitable that Clojure users will get bitten by this once in a while
>>> and hours will be wasted.
>>>
>>> It is also very disturbing to realise that "(= a b)" doesn't always imply
>>> "(= (hash a) (hash b))" or "(= #{a} #{b})" as you would think.
>>
>> (inc)
>>
>> This is fundamentally broken behavior. Telling people to just learn to avoid
>> it is not good, IMO. If the hashes must be unequal, then = should return
>> false.
>>
>> As for backwards compatibility, note that if such a change were made to =,
>> it wouldn't affect anyone who was already following Andy's advice to avoid
>> mixing doubles and floats. IOW, it should only affect those who are doing
>> something you're not "supposed" to do anyway.
>>
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> Luc Prefontaine<lprefonta...@softaddicts.ca> sent by ibisMail!
>
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