private static String toEnvValue(Object o) {
        if (o instanceof Number || o instanceof Boolean) {
            return o.toString();
        }
        return '"' + o.toString() + '"';
    }
If larger or equal to 0 it mean that explicit mmaps shall not be included in coredump.
config-model/src/main/java/com/yahoo/vespa/model/AbstractService.java