code: private void performSetAdj(int position, boolean value) {
  		checkMutable();
  		final int i = position >> ADDRESS_BITS;
  		final long m = 1L << (position & ADDRESS_MASK);
  		if (value) {
  			bits[i] |=  m;
  		} else {
  			bits[i] &= ~m;
  		}
  	}
docs: specialized implementation for the common case of setting an individual bit