When I checked out io.js source code, git status shows as:

On branch v1.x
Your branch is up-to-date with 'origin/v1.x'.
Changes not staged for commit:
(use "git add ..." to update what will be committed)
(use "git checkout -- ..." to discard changes in working directory)

    modified:   deps/uv/docs/make.bat
    modified:   tools/gyp/gyp.bat
    modified:   tools/gyp/samples/samples.bat
    modified:   tools/wrk/deps/luajit/src/msvcbuild.bat
    modified:   tools/wrk/deps/luajit/src/xedkbuild.bat

Seems caused by 43e4c90, it add '*.bat text eol=crlf' into .gitattributes