René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: \"null\" + format","articleBody":"### Actual Behavior\r\n\r\nI want to declare a formatted string, that can be null, as such:\r\n\r\n```\r\ntoday:\r\n  type: [string, \"null\"]\r\n  format: date\r\n```\r\n\r\nAs per https://github.com/OAI/OpenAPI-Specification/issues/3148, I believe the above is a valid v3.1 spec. I could be wrong.\r\n\r\nHowever, when I validate a response `{'today': None}` I get the following error:\r\n\r\n`Unable to unmarshal value None for format date: strptime() argument 1 must be str, not None`\r\n\r\n\r\n### Expected Behavior\r\n\r\nResponse `{'today': None}` should pass validaiton.\r\n\r\n### Steps to Reproduce\r\n\r\nI made a self-contained single-file example with a test that fails: https://github.com/Pylons/pyramid_openapi3/blob/example/null/examples/singlefile/app.py\r\n\r\n1. Run the test with `python -m unittest app.py ` and it fails. \r\n2. Comment out [line 35](https://github.com/Pylons/pyramid_openapi3/blob/941b967cfdc51d149fe6dd11221143b68c5f1b9e/examples/singlefile/app.py#L35) (to remove `format: date`) and the test passes. \r\n\r\n### OpenAPI Core Version\r\n\r\nLatest master\r\n\r\n### OpenAPI Core Integration\r\n\r\npyramid_openapi3\r\n\r\n### Affected Area(s)\r\n\r\nvalidation\r\n\r\n### References\r\n\r\n_No response_\r\n\r\n### Anything else we need to know?\r\n\r\n_No response_\r\n\r\n### Would you like to implement a fix?\r\n\r\nNone","author":{"url":"https://github.com/zupo","@type":"Person","name":"zupo"},"datePublished":"2023-04-13T22:02:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/557/openapi-core/issues/557"}