#force_encoding(nil) fails on Windows
I read from The Ruby Programming Language that nil can be specified as "binary" or "ascii-8bit".
The book give a sample code on Page 61:
text = stream.readline.force_encoding("utf-8")
bytes = text.dup.force_encoding(nil) # nil encoding means binary
However, force_encoding(nil) doesn't work on Windows, it will raise a TypeError.
Maybe it's a bug for Windows?
ruby 1.9.2p180 (2011-02-18) [i386-mingw32]