Description

At the moment the DiscreteTimeSum and ExplicitTimeIntegral nodes are not calculated as part of the solve like other output variables if the output_variables solver arg is specified. This proposes handling these explicitly so that they work in a similar fashion to other output variables

Motivation

the time taken to calculate output variables can be a significant proportion of the solve time, but if they are calculated during the solve this becomes much faster

Possible Implementation

No response

Additional context

No response