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It was thus said that the Great 云风 Cloud Wu once stated:
> string.unpack is a power tool to process the binary data. Sometimes, we use
> userdata as a string (binary data) buffer. I think if string.unpack support
> userdata as parameter would be better for this case.
> And, if the userdata is a C struct, we can simply use string.unpack to
> extract the data from the C struct, otherwise we should copy it (by
> lua_pushlstring) to a string first.

  It's part of a much larger thread about using userdata as strings.  I
realize that what you are proposing isn't quite the same as the above
thread, but that particular message is probably worth repeating here.