public void putMult(int index, int len, E elem) {
		putAll(index, new IReadOnlyListFromMult<E>(len, elem));
    }
Set or add the specified element multiple times.
If the index is smaller than the size of the list, the existing element is replaced.
If the index equals the size of the list, the element is added.

@param index index of first element to set or add
@param len 	element to set or add
jphp-runtime/src/php/runtime/memory/support/IList.java