[DOC BUG] branch.autosetupmerge defaults to true, not false

In Git v1.5.4.1, Documentation/config.txt describes:

branch.autosetupmerge::
        Tells `git-branch` and `git-checkout` to setup new branches
        so that linkgit:git-pull[1] will appropriately merge from that
        remote branch.  Note that even if this option is not set,
        this behavior can be chosen per-branch using the `--track`
        and `--no-track` options.  This option defaults to false.

However, in builtin-branch.c:

static int branch_track = 1;

...

        if (!strcmp(var, "branch.autosetupmerge"))
                        branch_track = git_config_bool(var, value);

So if the option is not listed in .git/config, then it actually
defaults to true.  A demonstration with a bit older version:

$ git --version
git version 1.5.4.rc3
$ git config --unset branch.autosetupmerge
$ git branch demo elinks.cz/master
Branch demo set up to track remote branch refs/remotes/elinks.cz/master.
$