refactor: optimise parser for performance #21
Merged
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Closes #20
It is not verbatim copy of the TS version of the parser we wrote, as I didn't want to convert this package to typescript (let me know if you think that's still valid and OK to do).
It also handles infinity slightly differently (we chose to go with always returning a Date object, instead of returning either date or number) than the package mentioned in the issue.
The performance gains should still be there though.