Re: [RFC][Discussion] Closure optimizations

Hi Ilija, Thank you for this improvement. If I understand correctly, one of the predicted BC changes will fix one of the issues with unit test comparisons. The sebastianbergmann/comparator library cannot compare closures, because each closure is in fact a different instance. With your change, this might be resolved for static closures. So I see this is in fact very beneficial for the unit testing. https://github.com/sebastianbergmann/comparator/issues/129 Kind regards, Jorg On Sat, Jan 31, 2026 at 12:41 AM Ilija Tovilo <tovilo.ilija@gmail.com> wrote: > Hi everyone > > A week ago, I sent an e-mail to internals regarding two closure > optimizations with some subtle BC breaks. [1] While nobody objected, I > decided to create a short RFC anyway to avoid any possible controversy > due to the BC breaks. You can find it here: > > https://wiki.php.net/rfc/closure-optimizations > > Regards, > Ilija > > [1] https://externals.io/message/129825 >