Don't normalize labels inside the Reference constructor

CHANGELOG.md

@@ -24,6 +24,7 @@ Updates should follow the [Keep a CHANGELOG](https://keepachangelog.com/) princi
 
  - "Moved" the `TableOfContents` class into a new `Node` sub-namespace (with backward-compatibility)
  - Reference labels are now generated and stored in lower-case instead of upper-case
+ - Reference labels are no longer normalized inside the `Reference`, only the `ReferenceMap`
 
 ### Fixed
 

docs/1.5/upgrading.md

@@ -9,6 +9,8 @@ redirect_from: /upgrading/
 
 ## Changes
 
+`Reference` labels are no longer auto-normalized within the `Reference` constructor. Normalization only occurs within the `ReferenceMap`.
+
 ## Deprecations
 
 `Reference::normalizeReference()` has been deprecated. Use `TextNormalizer::normalize()` instead.

src/Reference/Reference.php

@@ -35,7 +35,7 @@ final class Reference implements ReferenceInterface
 
     public function __construct(string $label, string $destination, string $title)
     {
-        $this->label = (new TextNormalizer())->normalize($label);
+        $this->label = $label;
         $this->destination = $destination;
         $this->title = $title;
     }