bool SerializeToString(string* output) const;: serializes the message
and stores the bytes in the given string. Note that the bytes are
binary, not text; we only use the string class as a convenient
string output store binary data, and whether has "\0" in output
such as if i want to use output->size() or strlen(output->c_str())
get its length.
i see many "\n" in binary data, but not sure it whether has "\0",
since if has "\0" may have some problem for string to store it.
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