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When we first started using Build Optimizer, we saw a lot of the savings were tied to using the Uglify/Terser `pure_getters` option. This was intimately related with the structure and shape of the Angular codebase. The measurements we did at the time on angular.io showed a significant size reduction, from 1mb to about 600kb. Of these roughly 150kb were tied to using `pure_getters` if I remember correctly. Meanwhile the Angular codebase has changed significantly and I don't really see these savings anymore, so I don't think it makes sense to keep it on given that it is known to cause problems with some libraries. Closes #9231, #11439, #12096, #12128.