Caching for initial configurable values removes need to seed state

psalm.xml

@@ -32,6 +32,7 @@
                  <referencedMethod name="Erusev\Parsedown\Configurables\BlockTypes::settingUnmarked" />
                  <referencedMethod name="Erusev\Parsedown\Configurables\BlockTypes::removing" />
                  <referencedMethod name="Erusev\Parsedown\Configurables\Breaks::enabled" />
+                 <referencedMethod name="Erusev\Parsedown\State::mergingWith" />
             </errorLevel>
         </PossiblyUnusedMethod>
     </issueHandlers>

src/Parsedown.php

@@ -28,12 +28,6 @@ final class Parsedown
     public function __construct(State $State = null)
     {
         $this->State = $State ?: new State;
-
-        // ensure we cache the initial value if these weren't explicitly set
-        $this->State = $this->State->mergingWith(new State([
-            $this->State->get(BlockTypes::class),
-            $this->State->get(InlineTypes::class),
-        ]));
     }
 
     /**

src/State.php

@@ -9,9 +9,14 @@ final class State
 {
     /**
      * @var array<class-string<Configurable>, Configurable>
-     * */
+     */
     private $state;
 
+    /**
+     * @var array<class-string<Configurable>, Configurable>
+     */
+    private static $initialCache;
+
     /**
      * @param Configurable[] $Configurables
      */
@@ -48,13 +53,18 @@ final class State
      * @template-typeof T $configurableClass
      * @param class-string<Configurable> $configurableClass
      * @return T
-     * */
+     */
     public function get($configurableClass)
     {
-        return (isset($this->state[$configurableClass])
-            ? $this->state[$configurableClass]
-            : $configurableClass::initial()
-        );
+        if (isset($this->state[$configurableClass])) {
+            return $this->state[$configurableClass];
+        }
+
+        if (! isset(self::$initialCache[$configurableClass])) {
+            self::$initialCache[$configurableClass] = $configurableClass::initial();
+        }
+
+        return self::$initialCache[$configurableClass];
     }
 
     public function __clone()