autoprefix a minified file results in expanded css file

[rgruyters]

I have a Gruntfile with the following tasks:

sass: {
  build: {
    options: {
      style: 'compressed',
      sourcemap: true,
      precision: 7
    },
    files: [{
      expand: true,
      cwd: '<%= assets.sass %>',
      src: ['*.scss'],
      dest: '<%= assets.css %>',
      ext: '.css'
    }]
  }
},

autoprefixer: {
  options: {
    browsers: ['last 2 version'],
  },
  no_dest: {
    src: '<%= assets.css %>/!(*.min).css'
  }
}

When I run this autoprefix expands the CSS file.

Is it possible to minify the file after autoprefixer has been finished? (or leave it minified)
I know you can use cssmin (or csso) to minify the CSS file, but then the sourceMap entry gets removed from file.

For the record I have grunt-autoprefixer@0.4.2 installed.

[rgruyters]

Never mind. After updating to the latest version, 0.7.2, it keeps the file minified. (also updates the source map)

[nDmitry]

Yeah, that behavior was fixed in Autoprefixer 1.0.