While building a REST API for a project at work, I ran across a bug in the Swagger framework I was using: express-openapi. The OpenAPI v3 support in the framework was not coercing POST parameters to the types expressed in the OpenAPI definition, so I fixed the code, wrote tests, and worked with the maintainer to get it merged in.

https://github.com/kogosoftwarellc/open-api/pull/711