@Override
            public short applyAsShort(T object) {
                return (short) (firstInner.applyAsShort(object)
                    - secondInner.applyAsShort(object));
            }
Creates and returns an expression that takes the result of the two
expressions and add them together.

@param first   the first input expression
@param second  the second input expression
@param <T>     the input type
@return        the new expression
runtime-parent/runtime-compute/src/main/java/com/speedment/runtime/compute/internal/expression/MinusUtil.java