Fix function_to_dict() bugs

[Jonarod]

Title

Fix function_to_dict() formatting bugs

Relevant issues

Fixes #8539 and #9323

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• [ ] I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• [ ] I have added a screenshot of my new test passing locally
• [ ] My PR passes all unit tests on (make test-unit)[https://docs.litellm.ai/docs/extras/contributing_code]
• [x] My PR's scope is as isolated as possible, it only solves 1 specific problem

Unfortunately no time for testing right now. Feel free to just keep this PR as illustration .

Type

🐛 Bug Fix

Changes

Adds possibility to use arrays and enums properly.

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Name	Status	Preview	Comments	Updated (UTC)
litellm	❌ Failed (Inspect)			Mar 27, 2025 1:37am

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