Hello, I realised that it is possible to create an interval of floats. I think this is bad because, since intervals are computed by successively adding a number, it might result in precision errors. (0.0 to: 1.0 by: 0.1) asArray >>> #(0.0 0.1 0.2 0.30000000000000004 0.4 0.5 0.6000000000000001 0.7000000000000001 0.8 0.9 1.0) The correct (precise) way to do it would be to use ScaledDecimal: (0.0s1 to: 1.0s1 by: 0.1s1) asArray >>> #(0.0s1 0.1s1 0.2s1 0.3s1 0.4s1 0.5s1 0.6s1 0.7s1 0.8s1 0.9s1 1.0s1) I opened an issue about it: https://pharo.fogbugz.com/f/cases/22467/Float-should-not-implement-to-to-by-... <https://pharo.fogbugz.com/f/cases/22467/Float-should-not-implement-to-to-by-...> And Iâd like to discuss this with you. What do you think? Cheers, Julien --- Julien Delplanque Doctorant à lâUniversité de Lille http://juliendelplanque.be/phd.html Equipe Rmod, Inria Bâtiment B 40, Avenue Halley 59650 Villeneuve d'Ascq Numéro de téléphone: +333 59 35 86 40