diff --git a/composer.lock b/composer.lock
index b966efd..557f59b 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "6ed06e9556bdcc4bbbb5f3f23958e33d",
+    "content-hash": "80f59b5505ffc9b8d7fd2a408538d861",
     "packages": [
         {
             "name": "mensbeam/framework",
@@ -59,11 +59,11 @@
         },
         {
             "name": "mensbeam/html-parser",
-            "version": "dev-master",
+            "version": "dev-pretty-print",
             "source": {
                 "type": "git",
                 "url": "mensbeam-gitea:MensBeam/HTML-Parser.git",
-                "reference": "c5a3d635d542de6acfb704557341d37944a2e688"
+                "reference": "b145e1ebc9c94e3e0a8267345b21067c5b0dc110"
             },
             "require": {
                 "ext-dom": "*",
@@ -77,7 +77,6 @@
             "suggest": {
                 "ext-ctype": "Improved performance"
             },
-            "default-branch": true,
             "type": "library",
             "autoload": {
                 "psr-4": {
@@ -130,7 +129,7 @@
                 "parsing",
                 "whatwg"
             ],
-            "time": "2021-11-08T18:34:05+00:00"
+            "time": "2021-11-16T22:47:08+00:00"
         },
         {
             "name": "mensbeam/intl",
diff --git a/lib/Document.php b/lib/Document.php
index 47770d1..8f22682 100644
--- a/lib/Document.php
+++ b/lib/Document.php
@@ -443,6 +443,11 @@ class Document extends Node {
             switch ($key) {
                 case 'indentStep':
                     if (!is_int($value)) {
+                        $type = gettype($value);
+                        if ($type === 'object') {
+                            $type = get_class($value);
+                        }
+                        trigger_error("Value for serializer configuration option \"$key\" must be an integer; $type given", \E_USER_WARNING);
                         continue 2;
                     }
                 break;
@@ -451,10 +456,17 @@ class Document extends Node {
                 case 'serializeBooleanAttributeValues':
                 case 'serializeForeignVoidEndTags':
                     if (!is_bool($value)) {
+                        $type = gettype($value);
+                        if ($type === 'object') {
+                            $type = get_class($value);
+                        }
+                        trigger_error("Value for serializer configuration option \"$key\" must be an integer; $type given", \E_USER_WARNING);
                         continue 2;
                     }
                 break;
-                default: continue 2;
+                default:
+                    trigger_error("\"$key\" is an invalid serializer configuration option", \E_USER_WARNING);
+                    continue 2;
             }
 
             $parserConfig->$key = $value;
diff --git a/lib/Serializer.php b/lib/Serializer.php
index 7ea2705..266b6a3 100644
--- a/lib/Serializer.php
+++ b/lib/Serializer.php
@@ -45,28 +45,16 @@ class Serializer extends ParserSerializer {
         return false;
     }
 
-    protected static function treatAsBlock(\DOMNode $node): bool {
-        // NOTE: This method is used only when pretty printing. Implementors of userland
-        // PHP DOM solutions with template contents will need to extend this method to
-        // check for any templates and look within their content fragments for "block"
-        // content.
-        if ($node instanceof \DOMDocument || $node instanceof \DOMDocumentFragment) {
-            return true;
-        }
+    protected static function treatAsBlockWithTemplates(\DOMNode $node): bool {
+        $templates = $xpath->query('.//template[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"][not(ancestor::iframe[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::listing[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::noembed[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::noframes[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::noscript[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::plaintext[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::pre[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::style[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::script[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::textarea[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::title[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::xmp[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"])]', $node);
 
-        $xpath = new \DOMXPath($node->ownerDocument);
-        $result = ($xpath->evaluate(self::BLOCK_QUERY, $node) > 0);
+        foreach ($templates as $t) {
+            $content = Reflection::getProtectedProperty($t->ownerDocument->getWrapperNode($t)->content, 'innerNode');
 
-        if (!$result) {
-            $templates = $xpath->query('.//template[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"][not(ancestor::iframe[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::listing[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::noembed[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::noframes[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::noscript[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::plaintext[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::pre[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::style[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::script[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::textarea[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::title[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::xmp[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"])]');
-
-            foreach ($templates as $t) {
-                $content = Reflection::getProtectedProperty($t->ownerDocument->getWrapperNode($t)->content, 'innerNode');
-
-                // This circumvents a PHP XPath bug where it will silently fail to query
-                // nodes within fragments.
-                $clone = $content->cloneNode(true);
-                $span = $content->ownerDocument->createElement('span');
+            // This circumvents a PHP XPath bug where it will silently fail to query
+            // nodes within fragments.
+            $clone = $content->cloneNode(true);
+            $span = $content->ownerDocument->createElement('span');
                 $span->appendChild($clone);
 
                 if ($xpath->evaluate(self::BLOCK_QUERY, $span) > 0) {
@@ -75,7 +63,7 @@ class Serializer extends ParserSerializer {
             }
         }
 
-        return $result;
+        return false;
     }
 
     protected static function treatForeignRootAsBlock(\DOMNode $node): bool {
diff --git a/vendor-bin/phpunit/composer.lock b/vendor-bin/phpunit/composer.lock
index bacbb14..73a609c 100644
--- a/vendor-bin/phpunit/composer.lock
+++ b/vendor-bin/phpunit/composer.lock
@@ -1377,16 +1377,16 @@
         },
         {
             "name": "sebastian/exporter",
-            "version": "4.0.3",
+            "version": "4.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/exporter.git",
-                "reference": "d89cc98761b8cb5a1a235a6b703ae50d34080e65"
+                "reference": "65e8b7db476c5dd267e65eea9cab77584d3cfff9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/d89cc98761b8cb5a1a235a6b703ae50d34080e65",
-                "reference": "d89cc98761b8cb5a1a235a6b703ae50d34080e65",
+                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/65e8b7db476c5dd267e65eea9cab77584d3cfff9",
+                "reference": "65e8b7db476c5dd267e65eea9cab77584d3cfff9",
                 "shasum": ""
             },
             "require": {
@@ -1435,14 +1435,14 @@
                 }
             ],
             "description": "Provides the functionality to export PHP variables for visualization",
-            "homepage": "http://www.github.com/sebastianbergmann/exporter",
+            "homepage": "https://www.github.com/sebastianbergmann/exporter",
             "keywords": [
                 "export",
                 "exporter"
             ],
             "support": {
                 "issues": "https://github.com/sebastianbergmann/exporter/issues",
-                "source": "https://github.com/sebastianbergmann/exporter/tree/4.0.3"
+                "source": "https://github.com/sebastianbergmann/exporter/tree/4.0.4"
             },
             "funding": [
                 {
@@ -1450,7 +1450,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-09-28T05:24:23+00:00"
+            "time": "2021-11-11T14:18:36+00:00"
         },
         {
             "name": "sebastian/global-state",