[Datetime-SIG] naive DateTime, aware DateTime, precise DateTIme

[Ethan Furman]

Instead of making a new timedelta object, which, after all, represents exactly what it says, why don't we make a new DateTime and Time that do the duration arithmetic?

Anyone who wants that behaviour has to explicitly use the type so there would be no backwards compatibility issues with the existing DateTime, Time, or timedelta objects.

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~Ethan~