As it is being discussed in #8596, it seems the right system for these styles is fixed. With that, the fallback for them becomes more relevant, given they defined just a few symbols (10 and 12). The styles don't explicitly define a fallback, so it is decimal.

I have no knowledge on CJK languages, but I'm wondering if decimal is the best fallback for them. For example, other CJK related styles have cjk-decimal as fallback. So I'd like to discuss if this (or another style) would be a better fallback option here.