@function _limit-map-keys($map, $list-of-keys) {
  $r: _new-map();

  @each $l in $list-of-keys {
    @if map-has-key($map, $l) {
      $r: map-merge(
        $r, ($l: map-get($map, $l))
      );
    }
  }

  @return $r;
}