Fix OpenAI Chat stream: prevent tool_calls[].type becoming "functionf… #296
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…unction..."
When merging streaming deltas, delta was converted with as_json.deep_symbolize_keys, which left tool_calls[].type as the string "function". hash_merge_delta concatenates when the existing value is a String (hash[key] += value), so each chunk appended "function" and produced "functionfunctionfunction...".