CHANGELOG
=========
6.4
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* Add `DatePoint`: an immutable DateTime implementation with stricter error handling and return types
* Throw `DateMalformedStringException`/`DateInvalidTimeZoneException` when appropriate
* Add `$modifier` argument to the `now()` helper
6.3
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* Add `ClockAwareTrait` to help write time-sensitive classes
* Add `Clock` class and `now()` function
6.2
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* Add the component