From 6174c5454eec39b258b6856494135be92826ac9d Mon Sep 17 00:00:00 2001
From: Joshua Ramon Enslin <joshua@museum-digital.de>
Date: Wed, 14 Aug 2024 16:41:55 +0200
Subject: [PATCH] Clean em dashes from ISBNs during sanitization

---
 src/MD_STD_IN.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/MD_STD_IN.php b/src/MD_STD_IN.php
index 54b060a..4fa1ab1 100644
--- a/src/MD_STD_IN.php
+++ b/src/MD_STD_IN.php
@@ -411,7 +411,7 @@ final class MD_STD_IN {
         }
 
         // Remove hyphens
-        $input = trim(strtr($input, ["-" => "", "–" => ""]));
+        $input = trim(strtr($input, ["-" => "", "–" => "", '—' => '']));
 
         // ISBN 10
         if (\mb_strlen($input) === 10) {