fails:File.umask returns a Fixnum
fails:File.umask returns the current umask value for the process
fails:File.umask invokes to_int on non-integer argument
fails:File.umask always succeeds with any integer values
fails:File.umask raises ArgumentError when more than one argument is provided
fails(windows):File.umask returns the current umask value for this process (basic)
fails(windows):File.umask returns the current umask value for this process
