dd garbled output

[Steven Penny <svnpenn at gmail dot com>]

Using this file

    $ cat file.txt
    hello
    doge
    world

I can run this command

    $ grep -v doge file.txt | dd conv=notrunc of=file.txt

and get output as expected

    $ cat file.txt
    hello
    world

However with Cygwin the end result is garbled

    $ cat infile.txt
    hello
    world
    orld

What is causing this?

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