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What we found annoying so far with the DateTimeUnit things is that they throw an exception on duration=0.
We have code where we have a dynamic amount of days added:
```loopDate.plus(DateTimeUnit.DateBased.DayBased(fastingDays.size))```
Now this throws:
```java.lang.IllegalArgumentException: Unit duration must be positive, but was 0 days.
	at kotlinx.datetime.DateTimeUnit$DateBased$DayBased.&lt;init&gt;(DateTimeUnit.kt:68)```
Instead I would prefer to have the function just return the initial date instead of throwing when adding 0 dates.
Now we always need to write != 0 checks everywhere and use the initial instance

I don’t think that `DateTimeUnit.DateBased.DayBased` is supposed to be used :thinking_face:

Use one of those:
```.plus(0, DateTimeUnit.DAY)
.plus(DatePeriod(days = 0))```

I was looking at
```public actual fun LocalDate.plus(unit: DateTimeUnit.DateBased): LocalDate = plusNumber(1, unit)```


So to me it was intuitive to use `DateTimeUnit.DayBased(x)`

<https://github.com/Kotlin/kotlinx-datetime/issues/95>