We implement the extended version of this algorithm but don't take full advantage of it since we are limited to an i32 for our counter values.
ethiopic-numeric
CounterStyleDefinition::create
And also use it within `from_counter_style`
CounterStyleDefinition
This serves as an intermediate step between `CSSCounterStyleRule` and a fully built counter style which will be helpful for: - Determining whether a rule defines a counter style - Resolving extends cycles - Determining registration order
