Scripting - differences between Mac and Windows

Description

I have a onResponse() function in a script that works very well on mac.
The outline of it is:

async function onResponse(context, url, request, response) {
  var body = response.body;
  console.log(body)
  response.body = manipulate(body)
  return response
}

On Mac, the body is just what I expect (it's fundamentally a text format)

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-INDEPENDENT-SEGMENTS
...

On Windows however, the body seems to be a JSON object. When I log it, the console shows something like this:

[16:39:53.306]: onResponse) is executed with
Flow ID = 825
16:39:53.306 onResponse) is executed!
{"type": "Buffer",
"data": [
35,
69,
88,
84,
77,
51,
85.
10,
35.
69,
...
]}

Is that normal? Is there a simple way to avoid this type of difference and having scripts that will work on both OS?

In case it's relevant, the response headers are fundamentally the same.

Note: the Response > Body panel is showing the correct text data. The issue is only within the script

Start with the onResponse(context, url, request, response) script and compare response.body on macOS and Windows, using the Response > Body panel as the reference. Confirm whether Windows exposes a Buffer-shaped object while macOS exposes text, then verify that a consistent body representation allows manipulate(body) to work on both operating systems.