Polyfill

[fabiancook]

Thanks to @qwtel for the contributions, this will include first class support of a polyfill into the project.

The polyfill is still needing the edges taken care off, but for a first pass, to move forward we will need to merge this through and work through any issues that come up.

The core functionality of the implementation has not changed, and all the existing tests pass.

Contributes towards #9, but this work will continue

Checklist

• [x] run yarn build
• [x] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [x] commit message and code follows the Developer's Certification of Origin and the Code of conduct