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docs(downgrader): note Kiota typing the "null" branch as a string #83

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Merged
dinwwwh merged 2 commits into from
Oct 24, 2026
Merged

docs(downgrader): note Kiota typing the "null" branch as a string #83

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docs(downgrader): note Kiota typing the `"null"` branch as a string
claude Oct 24, 2026
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docs(downgrader): say 3.1 keeps the types, not item nullability, for …
claude Oct 24, 2026
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1 change: 1 addition & 0 deletions packages/downgrader/README.md
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Expand Up @@ -246,6 +246,7 @@ Accepts the default OAS dialect, which adds `discriminator`, `xml`, `externalDoc
- `patternProperties` that matches every name, as TypeBox emits for a record, is removed with its value schema rather than turned into `additionalProperties`.
- An untyped schema that gains a `format` from `contentEncoding` or `contentMediaType` also gains `type: "string"`, as 3.0 binary strings need, so it rejects non-string values it accepted. 3.0 tools find file uploads only by `type: "string"` with `format: "binary"`.
- OpenAPI Generator merges the `"null"` branch beside a `$ref` to a string enum into a new enum, so the reference is lost. Pass `--openapi-normalizer SIMPLIFY_ONEOF_ANYOF_ENUM=false` to keep it.
- Kiota reads the `"null"` branch's `type: "string"` as a real type, so array items that may be null, and a union of several types with null, come out as strings. Kiota reads 3.1 too, which keeps their types.

## Performance

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