public boolean addMult(int len, E elem) {
		return doAddAll(-1, new IReadOnlyListFromMult<E>(len, elem));
	}
Adds element multiple time to list.

@param elem element to be added to this list
@return <tt>true</tt> if this list changed as a result of the call
jphp-runtime/src/php/runtime/memory/support/IList.java