Binary sent is not the same as binary received

[ysfscream]

Discussed in #1692

^{Originally posted by soren-olesen June 12, 2024}
I subscribe with:
mqttx sub -h MY_IP -p 59883 -u username -P password -t test --file-save output.dat --format binary

I publish with:
mqttx pub -h MY_IP -p 59883 -u username -P password -t test --file-read input.aac --format binary

The result is that the output.dat is not the same file as the input.aac file.
Input.aac is 26KB
Output.dat is 46KB

The first number of bytes look ok (they are "text"), but everything else is wrong.

What am I doing wrong ?