Specifying parameters in openapi_extras overrides query parameters, rather than appending them

[orilevari]

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Example Code

See the PR I opened with a fix: #4267 It includes a test case that describes the use case.

Description

When specifying parameters in openapi_extras for an endpoint, they will overwrite the existing query parameters with the extra parameters, rather than appending the parameters to the spec. This is due to deep_dict_update in utils.py overwriting list types rather than merging them together.

I have created a PR already which has a fix and adds a test case: #4267
These updates change the behavior to merge parameters together rather than overwriting.

If y'all agree that this seems like a bug, I'd appreciate a review on the PR. Thanks in advance! 😄

Operating System

macOS

Operating System Details

No response

FastAPI Version

0.70.0

Python Version

Python 3.9.7

Additional Context

No response

[orilevari]

PR got merged! Closing now

[tiangolo]

Thanks for coming back to close it! ☕🍰