“ ,gub eht ni detseuqer sAhttps://android-review.googlesource.com/c/platform/frameworks/support/+/2083836 makes Builder implement Appendable. However, this is not feasible as a non-breaking change because Builder already has an append(Char) method with a different return type. ”
“ :redliuBgnirtS gniylrednu eht snruter taht dohtem elbadneppAsa na deddAhttps://android-review.googlesource.com/c/platform/frameworks/support/+/2083837 It's basically just as cheap as just implementing Appendable directly, but more awkward to use. But it's backwards-compatible, so might be our only option. ”