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Except that you cannot encode pretty valid Double.NaN or Date(), which is showstopper for many.

I remember mongodb started with json, but switched to in-house bson pretty early because of the json limitations.

Is there anything wrong with just using Date.now() to get a UNIX timestamp to store and then converting it for presentation on the client?

new Date().toJSON()

When you parse back the result of this, you are not getting Date back.