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getCollectionKeyTypes example

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;
        }

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;
        }

'INF' => \INF,
                                '-INF' => -\INF,
                                default => throw NotNormalizableValueException::createForUnexpectedDataType(sprintf('The type of the "%s" attribute for class "%s" must be float ("%s" given).', $attribute, $currentClass, $data), $data, [Type::BUILTIN_TYPE_FLOAT], $context['deserialization_path'] ?? null),
                            };
                    }
                }

                if (null !== $collectionValueType && Type::BUILTIN_TYPE_OBJECT === $collectionValueType->getBuiltinType()) {
                    $builtinType = Type::BUILTIN_TYPE_OBJECT;
                    $class = $collectionValueType->getClassName().'[]';

                    if (\count($collectionKeyType = $type->getCollectionKeyTypes()) > 0) {
                        $context['key_type'] = \count($collectionKeyType) > 1 ? $collectionKeyType : $collectionKeyType[0];
                    }

                    $context['value_type'] = $collectionValueType;
                } elseif ($type->isCollection() && \count($collectionValueType = $type->getCollectionValueTypes()) > 0 && Type::BUILTIN_TYPE_ARRAY === $collectionValueType[0]->getBuiltinType()) {
                    // get inner type for any nested array                     [$innerType] = $collectionValueType;

                    // note that it will break for any other builtinType                     $dimensions = '[]';
                    while (\count($innerType->getCollectionValueTypes()) > 0 && Type::BUILTIN_TYPE_ARRAY === $innerType->getBuiltinType()) {

break;
            }
        }

        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[] */

class TypeTest extends TestCase
{
    public function testConstruct()
    {
        $type = new Type('object', true, 'ArrayObject', true, new Type('int'), new Type('string'));

        $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()
    {