code: function isUserResult(item) {
    log.trace('isUserResult(%j)', item);
  
    if (! item) return(false);
    if (item.userPrincipalName) return(true);
    if (item.objectCategory) {
      re.isUserResult.lastIndex = 0; // Reset the regular expression
      return(re.isUserResult.test(item.objectCategory));
    }
    if ((item.objectClass) && (item.objectClass.length > 0)) {
      return(_.any(item.objectClass, function(c) { return(c.toLowerCase() === 'user'); }));
    }
    return(false);
  }
docs: Checks to see if the LDAP result describes a user entry.
  @param {Object} item The LDAP result to inspect.
  @returns {Boolean}