>As an aside, since you're making the distinction, can you have meaningful benefit without breakage? Eg, you're specifically separating the two - so can you have significant improvements without breakage?
One way is by having a new language feature which does not interact with anything else in the old version of the language, i.e. is orthogonal.
One way is by having a new language feature which does not interact with anything else in the old version of the language, i.e. is orthogonal.