Re: [PATCH 3/3] mingw: document the experimental standard handle redirection

> This feature is still highly experimental and has not even been
> contributed to the Git mailing list yet: the feature still needs to be
> battle-tested more.
>
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> ---
> +`GIT_REDIRECT_STDIN`::
> +`GIT_REDIRECT_STDOUT`::
> +`GIT_REDIRECT_STDERR`::
> +       (EXPERIMENTAL) Windows-only: allow redirecting the standard
> +       input/output/error handles. This is particularly useful in
> +       multi-threaded applications where the canonical way to pass
> +       standard handles via `CreateProcess()` is not an option because
> +       it would require the handles to be marked inheritable (and
> +       consequently *every* spawned process would inherit them, possibly
> +       blocking regular Git operations). The primary intended use case
> +       is to use named pipes for communication.
> ++
> +Two special values are supported: `off` will simply close the
> +corresponding standard handle, and if `GIT_REDIRECT_STDERR` is
> +`2>&1`, standard error will be redirected to the same handle as
> +standard output.