When POSTing a Multipart form via Javascript as in the following example
var formdata = "A new string\nHere";
formdata.split('').map(function(x){return x.charCodeAt(0);}).join(',')
This will output showing that only the newline character has made it into the string as we'd expect
"65,32,110,101,119,32,115,116,114,105,110,103,10,72,101,114,101"
Now, lets take that data and place it into a Multipart form
var multipartForm = new FormData();
multipartForm.append('data', formdata);
multipartForm.get('data').indexOf('\r');
// 12
This shows that the \n character has been replaced with a \r\n set.
Why has this taken place?
This seems to show that the mutlipart form is being opinionated about the kind of data I am sending and changing it, which I'd rather it didn't (all arguments about \n vs \r\n aside).