message: Use a default for `ignoreHover` when not supplied
  It is considered optional by the component props, so let's treat it as optional.
diff: @@ -43,7 +43,7 @@ const TooltipTarget: React.FC<IProps> = ({
  ...rest
  }) => {
  const [isFocused, focusProps] = useFocus();
  - const [isHovering, hoverProps] = useHover(ignoreHover);
  + const [isHovering, hoverProps] = useHover(ignoreHover || (() => false));
  // No need to fill up the DOM with hidden tooltip elements. Only add the
  // tooltip when we're hovering over the item (performance)
  