Experimental fix for https://github.com/firefly-iii/firefly-iii/issues/4424

app/Mail/ReportNewJournalsMail.php

@@ -40,14 +40,10 @@ class ReportNewJournalsMail extends Mailable
 {
     use Queueable, SerializesModels;
 
-    /** @var string Email address of the user */
-    public $email;
-    /** @var Collection A collection of groups */
-    public $groups;
-    /** @var string IP address of user (if known) */
-    public $ipAddress;
-    /** @var array All groups, transformed to array. */
-    public $transformed;
+    public string $email;
+    public Collection $groups;
+    public string $ipAddress;
+    public array $transformed;
 
     /**
      * ConfirmEmailChangeMail constructor.

app/Support/Twig/General.php

@@ -50,6 +50,7 @@ class General extends AbstractExtension
             $this->formatFilesize(),
             $this->mimeIcon(),
             $this->markdown(),
+            $this->floatval(),
         ];
     }
 
@@ -297,6 +298,19 @@ class General extends AbstractExtension
         );
     }
 
+    /**
+     * @return TwigFilter
+     */
+    protected function floatval(): TwigFilter
+    {
+        return new TwigFilter(
+            'floatval',
+            static function ($value): float {
+                return (float)$value;
+            }
+        );
+    }
+
     /**
      * Show icon with attachment.
      *