Hi Christoph, > Hi all, > > there has been a "small" change in the rounding logic of > _php_math_round()[1] a couple of months ago. A respective ticket, > claiming the new behavior would be a bug[2] had been filed a while ago > without proper triage so far. I'm bringing this to your attention, > because I'm afraid that there will be (many) more bug reports about this > in the future (note that the change only affects master, and only PHP > 8.4.0alpha1 has been released yet, so it is probably not widespreadly > tested yet). 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. > > My personal stance on this is simple: floating point arithmetic is not > exact per se, and changes to how PHP handles the details should only be > introduced, if they clearly improve things. This change apparently > improves some cases, but worsens others. 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. > > What do you think? > > [1] <https://github.com/php/php-src/pull/12222> > [2] <https://github.com/php/php-src/issues/14332> > > Cheers, > Christoph
As you know, I am the implementer of that change. At the time, I thought "just add another digit," but this may have been a more disruptive change than I realized. I'm not opposed to reverting this, but I don't have any strong opinions on whether it should be reverted. I'd like to hear other people's opinions as well. Regards, Saki
