question: @ SuppressWarnings ( "unchecked" ) public < V > FluxConcatArray < V > concatAdditionalIgnoredLast ( Publisher < ? extends V > source ) { int n = array . length ; Publisher < ? extends V > [ ] newArray = new Publisher [ n + 1 ] ; System . arraycopy ( array , 0 , newArray , 0 , n ) ; newArray [ n - 1 ] = new MonoIgnoreThen < > ( newArray [ n - 1 ] ) ; newArray [ n ] = source ; return new FluxConcatArray < > ( delayError , newArray ) ; }
target:  Returns a new instance which has the additional source to be merged together with the current array of sources. <p> This operation doesn't change the current FluxMerge instance.