String property validator constraint always min length >=0

[leumatt]

Jane version(s) affected: 7.5.1

Description

Generated validator constraints for string properties always contain minlength >=0 . I don't understand why .
It's a problem with special formats (binary for example) because of charset validation made in symfony minlength.

How to reproduce

OpenAPI file

{
  "openapi": "3.0.1",
  "info": {
    "title": "API Test",
    "version": "1.0"
  },
  "paths": {
    "/File": {
      "post": {
        "requestBody": {
          "content": {
            "multipart/form-data": {
              "schema": {
                "type": "object",
                "properties": {
                  "fichier": {
                    "type": "string",
                    "format": "binary"
                  },
                  "valid": {
                    "type": "boolean"
                  }
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "description",
            "content": {
              "application/json": {
                "schema": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    }
  }
}

$apiClient = \Vendor\Library\Generated\ApiName\Client::create();

$object = new \Vendor\Library\Generated\ApiName\Model\FilePostBody();
$object->setFichier( file_get_contents("test.pdf",'r'));
$object->setValid(true);

$apiClient->postFile($object));

Failed on validation =>

Array[fichier]:
    This value does not match the expected UTF-8 charset

Possible Solution

\jane-php\json-schema\Guesser\Validator\String_\MinLengthValidator.php line 21

((\is_array($object->getType()) ? \in_array('string', $object->getType()) : 'string' === $object->getType()) || null === $object->getType()) &&
            null !== $object->getMinLength();

Perhaps add a test to add minLength only if needed

((\is_array($object->getType()) ? \in_array('string', $object->getType()) : 'string' === $object->getType()) || null === $object->getType()) &&
            null !== $object->getMinLength() && $object->getMinLength()>0 ;