I ran into an error when trying to save some changes to a portal island. The odd thing was, the error wasn't pointing to the file I was editing. After tracking it down and fixing the problem, another error popped up. I fixed that. Finally, the portal island I edited saved without errors.
I decided to review all of the portal islands, because I don't normally edit them. The owners do.
I found that some used the new convention.
but some of them still used the old convention.
Despite the fact that there was a mixture of files, the software handled all the portals without throwing any errors other than actual problems. I know enough about programming to know that it took some skill and forethought to write the code to make it so robust.
So, kudos to the UBB programmers. They've proven they know what they're doing.