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getCollectionValueTypes example

private function validateAndDenormalize(array $types, string $currentClass, string $attribute, mixed $data, ?string $format, array $context): mixed
    {
        $expectedTypes = [];
        $isUnionType = \count($types) > 1;
        $extraAttributesException = null;
        $missingConstructorArgumentsException = null;
        foreach ($types as $type) {
            if (null === $data && $type->isNullable()) {
                return null;
            }

            $collectionValueType = $type->isCollection() ? $type->getCollectionValueTypes()[0] ?? null : null;

            // Fix a collection that contains the only one element             // This is special to xml format only             if ('xml' === $format && null !== $collectionValueType && (!\is_array($data) || !\is_int(key($data)))) {
                $data = [$data];
            }

            // This try-catch should cover all NotNormalizableValueException (and all return branches after the first             // exception) so we could try denormalizing all types of an union type. If the target type is not an union             // type, we will just re-throw the catched exception.             // In the case of no denormalization succeeds with an union type, it will fall back to the default exception

case 'parent':
                        if (false !== $resolvedClass = $parentClass ??= get_parent_class($class)) {
                            break;
                        }
                        // no break
                    default:
                        $types[] = $type;
                        continue 2;
                }

                $types[] = new Type(Type::BUILTIN_TYPE_OBJECT, $type->isNullable(), $resolvedClass, $type->isCollection(), $type->getCollectionKeyTypes(), $type->getCollectionValueTypes());
            }
        }

        if (!isset($types[0])) {
            return null;
        }

        if (!\in_array($prefix, $this->arrayMutatorPrefixes, true)) {
            return $types;
        }

if ($scalar && !\in_array($type->getBuiltinType(), [PropertyInfoType::BUILTIN_TYPE_INT, PropertyInfoType::BUILTIN_TYPE_FLOAT, PropertyInfoType::BUILTIN_TYPE_STRING, PropertyInfoType::BUILTIN_TYPE_BOOL], true)) {
                    $scalar = false;
                }

                if (!$nullable && $type->isNullable()) {
                    $nullable = true;
                }
            }
            if (!$hasTypeConstraint) {
                if (1 === \count($builtinTypes)) {
                    if ($types[0]->isCollection() && \count($collectionValueType = $types[0]->getCollectionValueTypes()) > 0) {
                        [$collectionValueType] = $collectionValueType;
                        $this->handleAllConstraint($property, $allConstraint, $collectionValueType, $metadata);
                    }

                    $metadata->addPropertyConstraint($property, $this->getTypeConstraint($builtinTypes[0], $types[0]));
                } elseif ($scalar) {
                    $metadata->addPropertyConstraint($property, new Type(['type' => 'scalar']));
                }
            }

            if (!$nullable && !$hasNotBlankConstraint && !$hasNotNullConstraint) {

$this->assertEquals(Type::BUILTIN_TYPE_OBJECT, $type->getBuiltinType());
        $this->assertTrue($type->isNullable());
        $this->assertEquals('ArrayObject', $type->getClassName());
        $this->assertTrue($type->isCollection());

        $collectionKeyTypes = $type->getCollectionKeyTypes();
        $this->assertIsArray($collectionKeyTypes);
        $this->assertContainsOnlyInstancesOf('Symfony\Component\PropertyInfo\Type', $collectionKeyTypes);
        $this->assertEquals(Type::BUILTIN_TYPE_INT, $collectionKeyTypes[0]->getBuiltinType());

        $collectionValueTypes = $type->getCollectionValueTypes();
        $this->assertIsArray($collectionValueTypes);
        $this->assertContainsOnlyInstancesOf('Symfony\Component\PropertyInfo\Type', $collectionValueTypes);
        $this->assertEquals(Type::BUILTIN_TYPE_STRING, $collectionValueTypes[0]->getBuiltinType());
    }

    public function testIterable()
    {
        $type = new Type('iterable');
        $this->assertSame('iterable', $type->getBuiltinType());
    }

case 'parent':
                            if (false !== $resolvedClass = $parentClass ??= get_parent_class($class)) {
                                break;
                            }
                            // no break
                        default:
                            $types[] = $type;
                            continue 2;
                    }

                    $types[] = new Type(Type::BUILTIN_TYPE_OBJECT, $type->isNullable(), $resolvedClass, $type->isCollection(), $type->getCollectionKeyTypes(), $type->getCollectionValueTypes());
                }
            }
        }

        if (!isset($types[0])) {
            return null;
        }

        if (!\in_array($prefix, $this->arrayMutatorPrefixes)) {
            return $types;
        }

        }

        if (null !== $firstTypeIndex && null !== $nullableTypeIndex) {
            $firstType = $types[$firstTypeIndex];
            $types[$firstTypeIndex] = new Type(
                $firstType->getBuiltinType(),
                true,
                $firstType->getClassName(),
                $firstType->isCollection(),
                $firstType->getCollectionKeyTypes(),
                $firstType->getCollectionValueTypes()
            );
            unset($types[$nullableTypeIndex]);
        }

        return array_values($types);
    }

    /** * @return Type[] */
    private function extractTypes(TypeNode $node, NameScope $nameScope): array
    {