Sass jquery-like extend

/// jQuery-style extend function
/// About `map-merge()`:
/// * only takes 2 arguments
/// * is not recursive
/// @param {Map} $object - first map
/// @param {ArgList} $objects - other maps
/// @param {Bool} $deep - recursive mode
/// @return {Map}
@function extend($object, $objects.../*, $deep */) {
  $last: nth($objects, -1);
  $deep: $last == true; 
  $max: if($deep, length($objects) - 1, length($objects));
  
  // Loop through all maps in $objects...
  @for $i from 1 through $max {
    // Store current map
    $current: nth($objects, $i);
    
    // If not in deep mode, simply merge current map with object
    @if not $deep {
      $object: map-merge($object, $current);
    }
    
    // If in deep mode
    @else {
      // Loop through all tuples in current map
      @each $key, $value in $current {
        // If value is a nested map and same key from object is a nested map as well
        @if type-of($value) == "map" and type-of(map-get($object, $key)) == "map" {
          // Recursive extend
          $value: extend(map-get($object, $key), $value, true);
        }
        // Merge current tuple with object
        $object: map-merge($object, ($key: $value));
      }
    }
  }

  @return $object;
}

// // Example
// // ---
// $map-1: (
//   "first": "test",
//   "second": "string",
//   "third": (
//     "nested": "gloubi",
//     "map": 1337
//   )
// );

// $map-2: (
//   "first": 1,
//   "second": ( "ohai": true ),
//   "third": (
//     "map": 42
//   )
// );

// $map-3: (
//   "new": "pwet",
//   "third": (
//     "are cool": 100
//   )
// );

// test {
//   extend-standard  : inspect(extend($map-1, $map-2, $map-3));
//   extend-recursive : inspect(extend($map-1, $map-2, $map-3, true));
// }

// test {
//   extend-standard: ("first": 1, "second": (("ohai": true)), "third": (("are cool": 100)), "new": "pwet");
//   extend-recursive: ("first": 1, "second": (("ohai": true)), "third": (("nested": "gloubi", "map": 42, "are cool": 100)), "new": "pwet");
// }