Powershell Editing Xml causing Visual Studio to report Inconsistent Line Ending

Pipe Get-Content through Out-String:

[xml] $xml = Get-Content 'foo.xml' | Out-String
$xml.foo.bar = 'baz'
$xml.Save('foo.xml')

I just tested this: without Out-String, I see the message in Visual Studio. With Out-String, I don't, and comments are left alone.