This date/time precision sure is tricky with these health documents, which is why I mostly ignored it in `Documents.parseDate` (we'll definitely want to do some smarter parsing in the future). I think this is great – certainly a step in the right direction. We'll just keep evolving as we gain more experience working with data.

That replacer param is pretty clever! All these years doing JS development and I never gave any thought to that `null` in `JSON.stringify`, ha!