See Github #7819, #7829, #7830, #7835 and friends.

Summary: because this is number_to_human_size not 
number_to_computer_scientist_size. Human here refers to your users/customers. 
If they happen to be computer scientists you should roll your own (and maybe 
make it a gem and open source it).
—
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On Sun, Mar 24, 2013 at 8:15 AM, Roman Novikov <[email protected]> wrote:

> Why rails doesn't follow standart?
> Example:
> number_to_human_size(10000000, prefix: :si) -> '10 MB'
>>
> This is ok.
>  helper.number_to_human_size(10000, prefix: :si) -> '10 KB'
>>
> This must be '10 *k*B' 
>  
>> helper.number_to_human_size(10000000) -> '9.54 MB'
>>
> WTF?   '9.54 *MiB*' is right, binary prefix*!*
> Please look this http://en.wikipedia.org/wiki/Binary_prefix
> Page from metrologia (2000) 
> http://habrastorage.org/storage2/8da/ab2/cca/8daab2cca2ac7d60544ea7af68a5eb75.jpg
> Also, Use si (Decimal prefix) by default is good idea. (Why it names si?)
> Tell me am I right? 
> I really want make rails better, how I can fix this issue? 
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