Hi Christoph,

> Hi!
> 
>> On 12.07.2024 at 17:26, Claude Pache wrote:
>> 
>>>> Le 12 juil. 2024 à 13:24, Christoph M. Becker <cmbecke...@gmx.de> a écrit :
>>> 
>>> […]  At the very least we should be sure that we want to keep
>>> this change, and document it well, to avoid discussions in every filed
>>> ticket.
>>> 
>>> […] Thus, I think the change
>>> should better be reverted, and if at all, postponed to PHP 9, since I
>>> neither regard this change as bug fix nor as a feature.
>> 
>> See [1] and [2], which motivated the change.
> 
> Ah, thank you!  I probably should have checked this more thouroughly;
> now even I can see that there was a *bug*, so it is okay for me to stick
> with the fix (thank you, Saki!), but maybe UPGRADING should clarify the
> issue a bit.  Currently, it states:
> 
> | The maximum precision that can be handled by round() has been extended
> | by one digit.
> 
> While that is technically correct, probably few readers understand the
> implications.
> 
>> I expect that `round($anything) == (int) round($anything)` for any float 
>> between PHP_INT_MIN and PHP_INT_MAX, and I think that the change fixed that .
> 
> It seems to me that this is a reasonable expectation.
> 
>> Therefore, I am for keeping the change, and ensuring that there are test 
>> cases for 4503599627370495.5 (the largest float with fractional part).
> 
> Makes sense (unless there is already such a test, of course).
> 
>> [1]: https://github.com/php/php-src/issues/12143#issuecomment-1713465981
>> [2]: https://3v4l.org/3Q7BC
> 
> Cheers,
> Christoph

If this can be considered a bug fix, then I'm in favor of keeping it as is. (I 
wasn't sure if this should be considered a feature addition.)

I will update UPGRADING with concrete examples.

Regards,

Saki

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