code: function (subpath) {
      var value = this.sub(subpath).get();
      return Imm.Iterable.isIterable(value) ? value.toJS() : value;
    }
docs: Convert to JS representation.
  @param {String|Array} [subpath] subpath as a dot-separated string or an array of strings and numbers
  @return {*} JS representation of data at subpath