constructor(paths) {
    const msg = 'For your own good, using `document.save()` to update an array '
            + 'which was selected using an $elemMatch projection OR '
            + 'populated using skip, limit, query conditions, or exclusion of '
            + 'the _id field when the operation results in a $pop or $set of '
            + 'the entire array is not supported. The following '
            + 'path(s) would have been modified unsafely:\n'
            + '  ' + paths.join('\n  ') + '\n'
            + 'Use Model.updateOne() to update these arrays instead.';
    // TODO write up a docs page (FAQ) and link to it
    super(msg);
  }
DivergentArrayError constructor.
@param {Array<String>} paths
@api private