### Breaking changes

The serialized parser format changed.

Pseudo-props like `name`, `dialect`, `inline` and `dynamicPrec` now require an `@` in front of them when specified in a rule's prop list.

`@export` is now specified as a pseudo-prop instead of in front of the rule.

Top rule names are now required.

### New features

Rules can now specify an `@isGroup` pseudo-prop to automatically attach a group name to all the (single) named nodes they produce.