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* php-nextgen - Fix flatten() to support arrays of files in multipart/form-data Previously, FormDataProcessor::flatten() unconditionally passed all values through ObjectSerializer::toString(), which caused an error when flattening arrays containing file resources (e.g. for OpenAPI multipart/form-data definitions with `type: array`, `items: type: string, format: binary`). This change adds a check for is_resource() to preserve stream handles without serialization, ensuring correct behavior when uploading multiple files in a single request. * php-nextgen - Fix flatten() to support arrays of files in multipart/form-data - samples