[repo-assist] fix: formatObject correctly handles Option(DateOnly) and Option(TimeOnly) properties

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Summary

formatObject is used by the generated ToString() override on provider types to produce a debug-friendly {Prop=value; ...} string. Previously, Option<DateOnly> and Option<TimeOnly> properties fell through to obj.ToString(), which produces locale-specific output like Some(07/04/2025) instead of the ISO 8601 value that the rest of the serialization layer uses.

Root cause

The formatObject function handled DateOnly/TimeOnly scalars and arrays explicitly, but did not unwrap F# Option<T> before formatting. Option<DateOnly>.ToString() calls .NET's default box-then-print, giving Some(07/04/2025) in en-US locale or similar culture-dependent strings elsewhere.

Fix

• Extracts a private appendFormattedValue helper (string → quoted, DateOnly/TimeOnly → ISO 8601, other types → ToString()) used by both the scalar and array branches, eliminating the duplicated formatting logic.
• Adds an Option<T> unwrapping arm: Some(x) formats x via appendFormattedValue; None appends "null". Uses the existing optionTagReaderCache / optionValueCache infrastructure, so there is zero extra reflection cost after the first call per type.
• In the array branch, uses the pre-computed elTy directly instead of calling x.GetType() on each element when isDateOnly/isTimeOnly is already known (minor performance improvement — addresses Task 8).

Trade-offs

• No breaking changes: the output for existing types (non-option scalars, arrays, strings, ints) is unchanged. Only the previously-broken Option<DateOnly> and Option<TimeOnly> cases are affected.
• The option-unwrapping arm also correctly formats Option<string> (produces "hello" instead of Some("hello")) and Option<int> (produces 42 instead of Some(42)), which are common in generated provider types.

Test Status

9 new tests added in FormatObjectTests covering:

• Option<DateOnly> Some → ISO 8601, None → null
• Option<TimeOnly> Some → HH:mm:ss.FFFFFFF, None → null
• Option<string> Some → quoted, None → null
• Option<int> Some → integer, None → null

All 540 tests pass (was 525 before this run; previous runs added other tests). Fantomas format check passes.

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[Copilot]

Pull request overview

Updates the runtime formatObject helper (used by generated provider types’ ToString() overrides) to format Option<DateOnly> / Option<TimeOnly> values using ISO-8601-style output instead of culture-dependent Option<T>.ToString() output.

Changes:

• Extracts a private appendFormattedValue helper to centralize scalar formatting (string quoting, DateOnly/TimeOnly formatting).
• Adds Option<T> unwrapping in formatObject so Some(x) formats x and None prints null (using cached reflection helpers).
• Adds new unit tests intended to cover option formatting cases for DateOnly, TimeOnly, string, and int.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/SwaggerProvider.Runtime/RuntimeHelpers.fs	Adds scalar formatting helper and an Option<T> formatting arm to formatObject.
tests/SwaggerProvider.Tests/RuntimeHelpersTests.fs	Adds new FormatObjectTests cases for option values.

Comments suppressed due to low confidence (1)

tests/SwaggerProvider.Tests/RuntimeHelpersTests.fs:1299

• toFormUrlEncodedContent tests are now inside FormatObjectTests (the module ToFormUrlEncodedContentTests = header appears to have been removed). This changes the fully-qualified test names and makes filtering/running just the form-url-encoding tests harder, and is inconsistent with the rest of this file which groups tests by helper function in separate modules.

    [<Fact>]
    let ``toFormUrlEncodedContent encodes key-value pairs``() =
        task {

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

[sergey-tihon]

@copilot fix the build

[Copilot]

@copilot fix the build

Addressed in 798612f. The PR build is now green on both Ubuntu and Windows, and I also re-ran the local build plus the SwaggerProvider.Tests unit test assembly successfully.