PR 1927 is a definite improvement. By using _get_osfhandle() instead of caching the handle value, it guarantees that access to the original console file can be saved and restored via `fd_save = dup(fd)` and `dup2(fd_save, fd)`. It also allows duping a new open of CON, CONIN$, or CONOUT$, or even a new screen buffer from CreateConsoleScreenBuffer(), to the existing fileno(), and the _WindowsConsoleIO() instance will march along none the wiser.