in src/main/java/org/apache/sling/jcr/repoinit/impl/AclUtil.java [730:735]
public boolean isContainedIn(JackrabbitAccessControlEntry other) throws RepositoryException {
return other.getPrincipal().equals(principal)
&& contains(other.getPrivilegeCollection(), privilegeNames)
&& other.isAllow() == isAllow
&& sameRestrictions(other);
}