@Override
        public void log(Level level, String message) {
            msgs.add(message);
        }
Expression evaluation has no stack so function arguments are bound at config time creating a separate version of
each function for each binding, using hashes to name the bound variants of the function.
This method censors those hashes for string comparison.
config-model/src/test/java/com/yahoo/schema/RankingExpressionInliningTestCase.java