Still seriously underspecified for an interoperable spec. You haven’t defined the input or output forms anywhere near precisely enough, or how to order alphabet

Still seriously underspecified for an interoperable spec. You haven’t defined the input or output forms anywhere near precisely enough, or how to order alphabetically by last name (sorting depends on locale: e.g. is æ equivalent to ae—though that still raises stability questions—a letter after a, a letter after z, something else? I think there are languages that treat it as each of these. Or are you just rejecting anything beyond ASCII letters, which will cause different trouble?), or what to do about two people with the same weight and last name. Web specs need to consider all of these sorts of things. That’s why they’re verbose—they’re designed to be implementable and complete.