[JsonStreamer] Fix decoding iterable lists

Author: mtarld

src/Symfony/Component/JsonStreamer/Read/PhpAstBuilder.php

@@ -379,10 +379,12 @@ private function buildCollectionNodeStatements(CollectionNode $node, bool $decod
             ? $this->builder->funcCall($this->builder->var('iterable'), [$this->builder->var('stream'), $this->builder->var('data')])
             : $this->builder->funcCall($this->builder->var('iterable'), [$this->builder->var('data')]);
 
+        $collectionKeyType = $node->getType()->getCollectionKeyType();
+
         $prepareDataStmts = $decodeFromStream ? [
             new Expression(new Assign($this->builder->var('data'), $this->builder->staticCall(
                 new FullyQualified(Splitter::class),
-                $node->getType()->isList() ? 'splitList' : 'splitDict',
+                ($collectionKeyType instanceof BuiltinType && TypeIdentifier::INT === $collectionKeyType->getTypeIdentifier()) ? 'splitList' : 'splitDict',
                 [$this->builder->var('stream'), $this->builder->var('offset'), $this->builder->var('length')],
             ))),
         ] : [];

src/Symfony/Component/JsonStreamer/Tests/JsonStreamReaderTest.php

@@ -87,7 +87,7 @@ public function testReadCollection()
         $this->assertRead($reader, function (mixed $read) {
             $this->assertIsIterable($read);
             $this->assertSame([true, false], iterator_to_array($read));
-        }, '{"0": true, "1": false}', Type::iterable(Type::bool(), Type::int()));
+        }, '[true, false]', Type::iterable(Type::bool(), Type::int()));
     }
 
     public function testReadObject()