message: fix Position import
diff: import React from 'react'
  -import Position from './Position'
  +import {Position} from './Position'
  import Caret from './Caret'
  function CaretBox(props) {
  @@ -22,6 +22,7 @@ CaretBox.propTypes = {
  CaretBox.defaultProps = {
  ...Position.defaultProps,
  + // FIXME: spread Box.defaultProps here?
  bg: 'white',
  border: 1,
  borderColor: 'gray.2',
  