bug: code evaluator docs show `data_type`/`dataType` as equivalent, but a plain dict return requires camelCase in both languages

在 Langfuse 的 Code Evaluator 中,如果 Python 函数返回一个普通字典(plain dict),则字典内每个 score 都必须使用 dataType (camelCase)键名,即使是在 Python 环境中。若使用 data_type (snake_case),运行
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