I dont think that this result is expected, also getRegisterable returns the complete domain name with the subdomain in it.
Example:

Utopia\Domains\Domain Object
(
    [domain:protected] => notcivil.blogspot.com
    [TLD:protected] =>
    [suffix:protected] =>
    [name:protected] =>
    [sub:protected] =>
    [parts:protected] => Array
        (
            [0] => notcivil
            [1] => blogspot
            [2] => com
        )

)

Invoked via

require_once(dirname(__FILE__) . "/vendor/autoload.php");
$domain = new \Utopia\Domains\Domain("notcivil.blogspot.com");

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👟 Reproduction steps

This occurs for domains with * in the suffix list: https://publicsuffix.org/list/public_suffix_list.dat
for example:

$domain = new Domain('example.com.jm');
$domain->getSuffix();

👍 Expected behavior

"com.jm"

👎 Actual Behavior

"" (empty)

🎲 Utopia Domain version

Version 0.2.x

💻 Operating system

Linux

🐘 PHP Version

PHP 7.4.x

🧱 Your Environment

No response

👀 Have you spent some time to check if this issue has been raised before?

• I checked and didn't find similar issue

🏢 Have you read the Code of Conduct?

• I have read the Code of Conduct

👟 Reproduction steps

    $domain_check = new Domain($data['domain']);
    var_dump($domain_check->get());
    var_dump($domain_check->getTLD());
    var_dump($domain_check->getSuffix());
    var_dump($domain_check->getRegisterable());
    var_dump($domain_check->getName());
    var_dump($domain_check->getSub());
    var_dump($domain_check->isKnown());
    var_dump($domain_check->isICANN());
    var_dump($domain_check->isPrivate());
    var_dump($domain_check->isTest());die();

string(16) "www.test-8__.com"
string(3) "com"
string(3) "com"
string(12) "test-8__.com"
string(8) "test-8__"
string(3) "www"
bool(true)
bool(true)
bool(false)
bool(false)

👍 Expected behavior

test-8__.com is not valid for Register
I think should add $domain_check->isRootDomain() to check if is a valid domain with Registerable

👎 Actual Behavior

1

🎲 Utopia Domain version

Version 0.2.x

💻 Operating system

Linux

🐘 PHP Version

PHP 8.0

🧱 Your Environment

No response

👀 Have you spent some time to check if this issue has been raised before?

• I checked and didn't find similar issue

🏢 Have you read the Code of Conduct?

• I have read the Code of Conduct

Steps to reproduce

$domain = new Domain('http://facebook.com');
$domain2 = new Domain('http://www.facebook.com');

$domain->getRegisterable()); // 'http://facebook.com'
$domain2->getRegisterable()); // 'facebook.com'