SDK LrFileUtils.readFile adds extra CR characters on Windows - is this normal?

[LightroomStatistics]

While reading a log file from a Python program I noticed that LrFileUtils.readFile adds "CR" character for every new line "CRLF" in Windows. 

In the sample script below I compare "LrFileUtils.readFile" with "io"

Is this normal or is this a bug?

File contents

line 1
line 2
line 3

To reproduce I use this small script

local LrDialogs         = import "LrDialogs"
local LrFunctionContext = import "LrFunctionContext"
local LrFileUtils       = import "LrFileUtils"

local JSON              = require "JSON"
local inspect           = require "inspect"

local logFilename       = 'TestReadFile'
local myLogger          = import 'LrLogger' (logFilename)
myLogger:enable("logfile")

local filePath = "D:/Temp/file.txt"

local function readJsonFile(path)
    local content
    local file = io.open(path, "r")

    if file then
        content = file:read("*all")
        file:close()
    else
        myLogger:info("Error opening file.")
    end

    return content
end

local function writeFile(content)
    local file = io.open(filePath, "w")
    if file then
        file:write(content)
        file:close()
        myLogger:info("String written to file successfully.")
    else
        myLogger:info("Error opening file.")
    end
end

local function main(context)
    local text = "line 1\nline 2\nline 3\n"
    writeFile(text)

    -- Open file file LrFileUtils.readFile( path )
    local contents = LrFileUtils.readFile(filePath)
    myLogger:info("File contents from LrFileUtils.readFile", contents)

    contents = readJsonFile(filePath)
    myLogger:info("File contents from io", contents)
end

LrFunctionContext.postAsyncTaskWithContext("Start culling", function(context)
    LrDialogs.attachErrorDialogToFunctionContext(context)
    main(context)
end)

In Windows using Notepad++ this is how the file look like:

File.txt

Lightroom logger file