bug #2833 [TwigComponent] Fix escaping of Alpine.js attribute keys containing numeric characters (klausi85)

This PR was squashed before being merged into the 2.x branch.

Discussion
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[TwigComponent] Fix escaping of Alpine.js attribute keys containing numeric characters

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Docs?         | no
| License       | MIT

Alpine.js attribute keys like ``@input`.debounce.500ms` (see https://alpinejs.dev/directives/on#debounce) will now be correctly handled without being escaped.

Commits
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dc992f7 [TwigComponent] Fix escaping of Alpine.js attribute keys containing numeric characters

Author: Kocal

src/TwigComponent/src/ComponentAttributes.php

@@ -80,7 +80,7 @@ public function __toString(): string
             //      xml:*, xmlns:*,
             // - special syntax names (Vue.js, Svelte, Alpine.js, ...)
             //      v-*, x-*, @*, :*
-            if (!ctype_alpha(str_replace(['-', '_', ':', '@', '.'], '', $key))) {
+            if (!ctype_alnum(str_replace(['-', '_', ':', '@', '.'], '', $key))) {
                 $key = (string) $this->escaper->escape($key, 'html_attr');
             }
 

src/TwigComponent/tests/Unit/ComponentAttributesTest.php

@@ -324,6 +324,7 @@ public static function provideSpecialSyntaxAttributeNames(): iterable
         yield ['@click'];
         // Alpine.js
         yield ['x-on:click'];
+        yield ['@input.debounce.500ms'];
     }
 
     public function testThrowsTypeErrorWithoutEscaperRuntime(): void