public <O1> AggregateParserPairBuilder<C, U, V, O1> withMapper(
            final @NonNull TypeToken<O1> outType,
            final @NonNull Mapper<C, U, V, O1> mapper
    ) {
        return new AggregateParserPairBuilder<>(this.first, this.second, mapper, outType);
    }
Creates a new {@link AggregateParserPairBuilder} with the given mapper.

@param outType the new output type
@param mapper  the mapper
@param <O1>    the new output type
@return a new {@link AggregateParserPairBuilder} with the given mapper
cloud-core/src/main/java/org/incendo/cloud/parser/aggregate/AggregateParserPairBuilder.java