Here's some info to keep in mind, in case the defaults ever do change.
<blockquote rel="S">Please, announce new config settings!
I discovered that in application appeared names with the same e-mail addresses...
Because UserModel::ValidateUniqueFields() doesnt return False, because
<pre>$Configuration['Garden']['Registration']['EmailUnique'] = False;
$Configuration['Garden']['Registration']['NameUnique'] = False;</pre>
by default, but should be True by default.