I've heard legends that somehow the `OrdinaryCallingFormat` doesn't work in other regions, and/or even in regions where it does work it may be slow.  Sound accurate?

I have like 40% of an implementation that's more rigorous, but a simple "has caps?" is easier to (not) test and delivers 100% accuracy for the cases it catches (obscure cases one does not catch: buckets that have names that "look like IPs", two dots in a row, a dash right before a dot, etc.)