message: adjust jsdoc
diff: @@ -219,6 +219,9 @@ export default class EditorModel {
  * inserts `str` into the model at `pos`.
  * @param {Object} pos
  * @param {string} str
  + * @param {Object} options
  + * @param {bool} options.validate Whether characters will be validated by the part.
  + * Validating allows the inserted text to be parsed according to the part rules.
  * @return {Number} how far from position (in characters) the insertion ended.
  * This can be more than the length of `str` when crossing non-editable parts, which are skipped.
  */
  