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Yes, for Python code, see https://github.com/ros/genpy/blob/cb07134e084a4fb6099de5cefcbb6b9a7f666cf5/src/genpy/message.py#L269

No, for C++ code, see https://github.com/ros/gencpp/blob/90a850954f7dec3d7274b4fc36d35b1fe6676b22/scripts/msg.h.template#L62

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