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This is fantastic!

I was a just looking for a fuzzer for OpenAPI stuff. I'm building a project with FastAPI that I'd love to try this on.

You can already do this using Hypothesis with the Pydantic plugin, https://pydantic-docs.helpmanual.io/hypothesis_plugin/. Here is an example for Quart-Schema (similar setup to FastAPI) https://pgjones.dev/blog/automatic-api-testing-2021.

Excellent! It's always nice to find useful tools you didn't know about.