@Override
    default ToEnum<T, E> map(UnaryOperator<E> mapper) {
        return MapperUtil.mapEnum(this, mapper);
    }
Returns an alternative expression that represents the {@link Enum#name()}
of the enum that would otherwise have been returned by this expression.

@return  the name expression
runtime-parent/runtime-compute/src/main/java/com/speedment/runtime/compute/ToEnum.java