newlines in a custom exposer library

[John Dexter]

I'm writing a exposer client library in a specialist language, and I cannot get newlines to work properly. The language makes it unclear what I'm _supposed_ to do for a start.

Looking at the docs: https://prometheus.io/docs/instrumenting/exposition_formats/

It just says "UTF-8, \n is newline." but even that is not clear https://stackoverflow.com/questions/13836352/what-is-the-utf-8-representation-of-end-of-line-in-text-file/13836410

What raw byte value should I be appending a line of text when responding to an HTTP request to be accepted by Prometheus, please?