Fix strict handling of length on objects

Author: theodorejb

src/Runtime.php

@@ -164,16 +164,16 @@ public static function prop(mixed $base, string $key): mixed
 
     /**
      * Terminal .length lookup: returns count() for arrays (since PHP arrays have no native .length
-     * property), an explicit 'length' key if present, or null for non-array bases.
-     * When $strict is true, throws for any non-array base, mirroring HBS.js strict-mode behavior.
+     * property), an explicit 'length' key if present, or null for non-array/non-object bases.
+     * When $strict is true, throws for objects without a 'length' property and for all scalar/null bases.
      */
     public static function lookupLength(mixed $base, bool $strict = false): mixed
     {
         if (is_array($base)) {
             return array_key_exists('length', $base) ? $base['length'] : count($base);
         }
-        if (is_object($base)) {
-            return $base->length ?? null;
+        if (is_object($base) && property_exists($base, 'length')) {
+            return $base->length;
         }
         if ($strict) {
             $desc = match (true) {

tests/ErrorTest.php

@@ -95,6 +95,12 @@ public static function renderErrorProvider(): array
                 'data' => ['foo' => 42],
                 'expected' => '"length" not defined in 42',
             ],
+            'strict mode .length on object without length property' => [
+                'template' => '{{foo.length}}',
+                'options' => new Options(strict: true),
+                'data' => ['foo' => (object) ['name' => 'test']],
+                'expected' => '"length" not defined in stdClass',
+            ],
             'strict mode null property access in if' => [
                 'template' => '{{#if foo.bar}}bad{{else}}OK{{/if}}',
                 'options' => new Options(strict: true),