[OpenAPI] Property schema has been overwritten due to suspicious type check

[c1tru55]

API Platform version(s) affected: 4.0.12

Description

in custom custom decorated api_platform.metadata.property.metadata_factory I return following property schema (schema_type = input):

  'exclusiveMinimum' => 0,
  'type' =>  [
    'integer',
    'null',
  ],

in a result on this line https://github.com/api-platform/core/blob/4.1/src/JsonSchema/SchemaFactory.php#L189 I have following variable values:

$isUnknown = false;
$propertySchema = [
  'exclusiveMinimum' => 0,
  'type' =>  [
    'integer',
    'null',
  ],
];
$propertySchemaType = [
  'integer',
  'null',
];

but since this condition is not passed:

        if (
            !$isUnknown && (
                [] === $types
                || ($propertySchema['$ref'] ?? $propertySchema['anyOf'] ?? $propertySchema['allOf'] ?? $propertySchema['oneOf'] ?? false)
                || (\is_array($propertySchemaType) ? \array_key_exists('string', $propertySchemaType) : 'string' !== $propertySchemaType)
                || ($propertySchema['format'] ?? $propertySchema['enum'] ?? false)
            )
        ) {
            $schema->getDefinitions()[$definitionName]['properties'][$normalizedPropertyName] = new \ArrayObject($propertySchema);

            return;
        }

my schema is changed to:

$propertySchema = [
  'exclusiveMinimum' => 0,
  'anyOf' => 
  [
    [
      '$ref' => '#/components/schemas/Entity.jsonld-Input',
    ],
    [
      'type' => 'null',
    ],
  ],
];

which is not I want.

How to reproduce

Possible Solution

not sure about this condition, why generated schema is changed at all: https://github.com/api-platform/core/blob/4.1/src/JsonSchema/SchemaFactory.php#L189
but this check looks suspicious:

\is_array($propertySchemaType) ? \array_key_exists('string', $propertySchemaType) : 'string' !== $propertySchemaType

especially when type in openapi schema should be string or plain array of strings.
https://datatracker.ietf.org/doc/html/draft-bhutton-json-schema-validation-00#section-6.1.1

Additional Context