### Breaking changes

It is no longer necessary to use the `tooltips` extension when using this package—just providing values through `showTooltip` will implicitly enable the necessary extensions.

Tooltips no longer use the `class` property on the spec object (just apply the class yourself when creating the DOM element).

### Bug fixes

Tooltips in a dark theme that doesn't explicitly style them no longer use the light theme defaults.

### New features

`showTooltip` now accepts null as input value, which doesn't produce a tooltip.