The #PatternMatcher in #fontconfig was written to solve a problem that it’s author decided to solve, but which is NOT the correct problem for the situation.

There seem to be only a handful of #computer programmers who are able to understand that this not an example of a buggy program, but of a program that simply should not exist.

IT SOLVES THE WRONG PROBLEM.

It is not a buggy program. It is a category error. There is no way to fix it. None.