This PR improves the OAS by adding `type: object` to schemas that have `properties` and no `type`. While this attribute is not required for a valid spec, omitting it opens the possibilities of non-object input. See https://stackoverflow.com/a/47390723 for a detailed description of this behavior. When generating code or schemas from an OAS with tools like takeshape.io having `type` attributes is important to get the correct behavior.
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