Default value is intrinsic to a configurable, we can just always

retrieve that.

src/Components/Blocks/Comment.php

@@ -78,7 +78,7 @@ final class Comment implements ContinuableBlock
         return new Handler(
             /** @return Text|RawHtml */
             function (State $State) {
-                if ($State->getOrDefault(SafeMode::class)->isEnabled()) {
+                if ($State->get(SafeMode::class)->isEnabled()) {
                     return new Text($this->html);
                 } else {
                     return new RawHtml($this->html);

src/Components/Blocks/Header.php

@@ -58,10 +58,8 @@ final class Header implements Block
 
         $text = \ltrim($Context->line()->text(), '#');
 
-        $StrictMode = $State->getOrDefault(StrictMode::class);
-
         if (
-            $StrictMode->isEnabled() && isset($text[0])
+            $State->get(StrictMode::class)->isEnabled() && isset($text[0])
             and $text[0] !== ' ' and $text[0] !== "\t"
         ) {
             return null;

src/Components/Blocks/Markup.php

@@ -76,9 +76,7 @@ final class Markup implements ContinuableBlock
         return new Handler(
             /** @return Element|RawHtml */
             function (State $State) {
-                $SafeMode = $State->getOrDefault(SafeMode::class);
+                if ($State->get(SafeMode::class)->isEnabled()) {
-
-                if ($SafeMode->isEnabled()) {
                     return new Element('p', [], [new Text($this->html)]);
                 } else {
                     return new RawHtml($this->html);

src/Components/Blocks/Reference.php

@@ -51,7 +51,7 @@ final class Reference implements StateUpdatingBlock
             ];
 
             $State = $State->setting(
-                $State->getOrDefault(DefinitionBook::class)->setting($id, $Data)
+                $State->get(DefinitionBook::class)->setting($id, $Data)
             );
 
             return new self($State);

src/Components/Inlines/Image.php

@@ -83,7 +83,7 @@ final class Image implements Inline
                     $attributes['title'] = $title;
                 }
 
-                if ($State->getOrDefault(SafeMode::class)->isEnabled()) {
+                if ($State->get(SafeMode::class)->isEnabled()) {
                     $attributes['src'] = Element::filterUnsafeUrl($attributes['src']);
                 }
 

src/Components/Inlines/Link.php

@@ -77,7 +77,7 @@ final class Link implements Inline
                 $definition = \strtolower($label);
             }
 
-            $data = $State->getOrDefault(DefinitionBook::class)->lookup($definition);
+            $data = $State->get(DefinitionBook::class)->lookup($definition);
 
             if (! isset($data)) {
                 return null;
@@ -122,7 +122,7 @@ final class Link implements Inline
                     $attributes['title'] = $this->title;
                 }
 
-                if ($State->getOrDefault(SafeMode::class)->isEnabled()) {
+                if ($State->get(SafeMode::class)->isEnabled()) {
                     $attributes['href'] = Element::filterUnsafeUrl($attributes['href']);
                 }
 

src/Components/Inlines/Markup.php

@@ -64,9 +64,7 @@ final class Markup implements Inline
         return new Handler(
             /** @return Text|RawHtml */
             function (State $State) {
-                $SafeMode = $State->getOrDefault(SafeMode::class);
+                if ($State->get(SafeMode::class)->isEnabled()) {
-
-                if ($SafeMode->isEnabled()) {
                     return new Text($this->html);
                 } else {
                     return new RawHtml($this->html);

src/State.php

@@ -43,27 +43,13 @@ final class State
         return new self($State->state + $this->state);
     }
 
-    /**
-     * @template T as Configurable
-     * @template-typeof T $configurableClass
-     * @param class-string<Configurable> $configurableClass
-     * @return T|null
-     * */
-    public function get($configurableClass)
-    {
-        return (isset($this->state[$configurableClass])
-            ? $this->state[$configurableClass]
-            : null
-        );
-    }
-
     /**
      * @template T as Configurable
      * @template-typeof T $configurableClass
      * @param class-string<Configurable> $configurableClass
      * @return T
      * */
-    public function getOrDefault($configurableClass)
+    public function get($configurableClass)
     {
         return (isset($this->state[$configurableClass])
             ? $this->state[$configurableClass]