[jruby-user] File.expand_path changes encoding?

[Roger Pack]

a = "C:\\Users\\packrd\\Desktop\\Die drei Br\u00FCder/9.mp4"

=> "C:\\Users\\packrd\\Desktop\\Die drei Br\u00FCder/9.mp4"

a.encoding

=> #<Encoding:UTF-8>

File.expand_path(a)

=> "C:/Users/packrd/Desktop/Die drei Br\xFCder/9.mp4"

File.expand_path(a).encoding

=> #<Encoding:IBM437>

However, in MRI [at least 1.9.3 anyway] it preserves the initial
encoding of UTF-8. Bug presumably? [I think so, since after converting
encodings I can no longer refer to the filename by that path it's like
it doesn't actually exist...]