Improve internal codebase

Author: nyamsprod

CHANGELOG.md

@@ -12,6 +12,7 @@ All Notable changes to `PHP Domain Parser` starting from the **5.x** series will
 
 - Using PHPUnit 10
 - `Domain` decorates the new `RegisteredName` class [#347](https://github.com/jeremykendall/php-domain-parser/issues/347)
+- `Host::withoutLabel` works without arguments.
 
 ### Deprecated
 

src/DomainTest.php

@@ -395,6 +395,13 @@ public function testwithoutLabelWorksWithMultipleKeys(): void
         self::assertNull(Domain::fromIDNA2008('www.example.com')->withoutLabel(0, 1, 2)->value());
     }
 
+    public function testWithoutLabelWorksWithoutArgument(): void
+    {
+        $domain = Domain::fromIDNA2008('www.example.com');
+
+        self::assertSame($domain, $domain->withoutLabel());
+    }
+
     #[DataProvider('resolveCustomIDNAOptionsProvider')]
     public function testResolveWorksWithCustomIDNAOptions(
         string $domainName,

src/RegisteredName.php

@@ -81,15 +81,11 @@ public static function fromIDNA2008(DomainNameProvider|Host|Stringable|string|in
      */
     private function parseDomain(DomainNameProvider|Host|Stringable|string|int|null $domain): ?string
     {
-        if ($domain instanceof DomainNameProvider) {
-            $domain = $domain->domain();
-        }
-
-        if ($domain instanceof Host) {
-            return $this->parseValue($domain->toUnicode()->value());
-        }
-
-        return $this->parseValue($domain);
+        return $this->parseValue(match (true) {
+            $domain instanceof DomainNameProvider => $domain->domain()->value(),
+            $domain instanceof Host => $domain->toUnicode()->value(),
+            default => $domain,
+        });
     }
 
     /**