In method jdk.jfr.internal.tool.Metadata.TypeComparator#compare
https://github.com/openjdk/jdk/blob/master/src/jdk.jfr/share/classes/jdk/jfr/internal/tool/Metadata.java#L67
```
if (package1.equals(package2)) {
    return n1.compareTo(n2);
} else {
    // Ensure that jdk.* are printed first
    // This makes it easier to find user defined events at the end.
    if (Type.SUPER_TYPE_EVENT.equals(t1.getSuperType()) && !package1.equals(package2)) {
        if (package1.equals("jdk.jfr")) {
            return -1;
        }
        if (package2.equals("jdk.jfr")) {
            return 1;
        }
    }
    return package1.compareTo(package2);
}
```
Equality of 'package1' and 'package2' is already checked first. No need to recheck it again.