v2.2.0

Improvements:

• Significantly lower the base overhead of calling Document(), resulting in a 240% reduction in the https://github.com/tktech/json_benchmark verysmall.json test, which has slowly crept up in time as we added support for more initial document types.

Misc:

• Various deprecated GitHub action dependencies updated.
• Deployment of new versions changed to work with GitHub Releases.