Write to multi-attribute or to-many assoc adds instead of replacing

[Clashsoft]

There is a NumList with numbers 1,2,3.
We write 4,5,6 into numbers of numList.
// numList.numbers == [1,2,3,4,5,6]

[Clashsoft]

There are two ways to achieve this behaviour:

1. Generate a without call before with:

    numList.withoutNumbers(numList.getNumbers().toArray());
    numList.withNumbers(4,5,6);
   

   The problem is that too many property change events are fired when the old and new items have common items.

2. Change https://github.com/fujaba/fulib to add a setNumbers method, which only creates events for items that are actually added and removed:

    NumList setNumbers(Integer... numbers) {
        // ...
        return this
    }
   

[Clashsoft]

Waiting for fujaba/fulib#11 / fujaba/fulib#37