Fix file upload bug on server

[hazelnutcloud]

Closes #123

Summary by CodeRabbit

• Bug Fixes
  • Correctly processes form fields with multiple values on the server, appending each value individually.
  • Improves compatibility with backends expecting repeated keys in multipart submissions.
  • Resolves issues where array fields were previously sent as a single value, preventing missing data.
  • More reliable handling for checkboxes, multi-select inputs, and repeated parameters in server-side form submissions.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Server-side multipart FormData construction now detects array field values and appends each element individually instead of appending the array as a single value. This affects handling of values like File[] during request body assembly in src/treaty2/index.ts. No exported/public signatures changed.

Changes

Cohort / File(s)	Summary
Server FormData handling src/treaty2/index.ts	Adjusted FormData building logic to check Array.isArray(value) and iterate to append each element; previous behavior appended array objects directly. Other logic unchanged.

Sequence Diagram(s)

sequenceDiagram
    autonumber
    participant C as Caller
    participant T as treaty2 (server)
    participant FB as FormData Builder
    participant FD as FormData
    participant HTTP as HTTP Client

    C->>T: invoke request with body (may include arrays e.g., File[])
    T->>FB: build multipart body
    FB->>FD: create FormData
    alt value is array
        loop for each element in array
            FB->>FD: append(key, element)
        end
    else value is single
        FB->>FD: append(key, value)
    end
    FB-->>T: FormData instance
    T->>HTTP: send request with FormData body
    HTTP-->>C: response

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

I thump my paws at bytes in line,
Arrays now hop in single file—so fine!
Each File a carrot, crisp and neat,
Plopped in the basket, one per seat.
No blobs of blob, no tangled string—
Multipart meadows, spring-spring-spring! 🥕✨

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 3c2548e and 89da73b.

📒 Files selected for processing (1)

• src/treaty2/index.ts (1 hunks)

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