Question about the separator of cmsgpack data

I want to store some lua table data in a file. I use cmsgpack.pack(table) to convert it into a binary string, and then write it into the file. But I encountered a separator problem. I tried to use '\n' as the separator at first, but I found that the binary string may also contain the separator '\n' , which made me unable to read the binary file correctly.

How should I store and use what delimiter to divide the data?