(In reply to comment #4) > > A Chinese colleague confirmed that this is indeed what he expects. > [snip] > > It would be nice if we could base this on some standard that's written down > somewhere, or more thoroughly documented as being de-facto common. I suspect that there is no such document. > > We now know that ICU implements option 1, so implementing the expected > > outcome will be more work. We also need to determine whether #2 or #3 are > > expected. > > It seems a little odd that ICU doesn't do something is apparently so common. My understanding is that all three options are valid, so ICU simply picked one. Perhaps they didn't pick the most popular one.