Most duration specifications can be normalized to valid durations with all positive components, but not all of them can.
The only situations which cannot be normalized are where the year/month and the day/hour/minute/second offsets are of opposite sign. Days cannot be carried into months since the length of a Gregorian month is variable depending on when the duration is applied. In these cases, this method normalizes the components so that "day" is the only negative component.
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