Update TemplateOutput to implement Stringable

CHANGELOG.md

@@ -20,6 +20,7 @@
 - Updated [Rcrowe/TwigBridge](https://github.com/rcrowe/TwigBridge) Dependency  from version 0.14.1 to 0.14.3
 - Relaxed GraphQL handling of fieldtypes during schema generation. Now errors will be logged but schemas can still be built
 - Default url for ExpressionEngine Control Panel is now `admin` instead of `admin.php`.  This can be changed in `config/coilpack.php`.
+- TemplateOutput now implements the [Stringable](https://www.php.net/manual/en/class.stringable.php) interface
 
 ## [1.4.2] - 2024-09-26
 

src/TemplateOutput.php

@@ -4,7 +4,7 @@
 
 use Illuminate\Contracts\Support\Arrayable;
 
-class TemplateOutput implements \ArrayAccess, \Countable, \IteratorAggregate
+class TemplateOutput implements \ArrayAccess, \Countable, \IteratorAggregate, \Stringable
 {
     protected $array = [];
 
@@ -136,7 +136,7 @@ public function offsetUnset($offset): void
         unset($this->array[$offset]);
     }
 
-    public function __toString()
+    public function __toString(): string
     {
         if (empty($this->string) && count($this->array) === 1 && is_string(current($this->array))) {
             return current($this->array);