feat: Support mixed types

[tremlin]

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Changelog Entry

Description

• Add support for simple mixed types in API spec.

Added

• Add support for simple mixed types in API spec.

Changed

Deprecated

Removed

Fixed

Security

Breaking Changes

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Additional Information

Spec of mixed types: https://swagger.io/docs/specification/v3_0/data-models/data-types/#mixed-types

The other PR #5 addresses a similar, but not the same issue.

Screenshots or Videos

[tjbck]

Thanks!