Hi Hakkars,

The file my stream created started to look rather funny so I had to dig a 
bit.

The API docs for FileIO.toFile state it "Overwrites existing files by 
default.", but that becomes a bit to literally with the default options.
(see http://doc.akka.io/api/akka/2.5/akka/stream/scaladsl/FileIO$.html )

  def toPath(f: Path, options: Set[StandardOpenOption] = Set(WRITE, CREATE))

For an existing file with options WRITE, CREATE the new content will 
overwrite the file's content from the file's start, but not truncate the 
old contents. So in case less content is written in later runs the old 
content will follow the new content. 

Wouldn't it be more intuitive (and more according to the docs) to use 
WRITE, CREATE, TRUNCATE_EXISTING as default options?
(see 
https://docs.oracle.com/javase/8/docs/api/java/nio/file/StandardOpenOption.html 
)

Cheers,
Enno.

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