message: Make size, square, and alt optional
diff: @@ -5,14 +5,14 @@ import theme from './theme'
  import sx, {SxProp} from './sx'
  interface AvatarCustomProps {
  - size: number,
  - square: boolean,
  - alt: string
  + size?: number,
  + square?: boolean,
  + alt?: string
  }
  -function getBorderRadius(props: { size: number, square: boolean }) {
  - if (props.square) {
  - return props.size <= 24 ? '4px' : '6px'
  +function getBorderRadius({ size, square }: { size?: number, square?: boolean }) {
  + if (square) {
  + return (size && size <= 24) ? '4px' : '6px'
  } else {
  return '50%'
  }
  