Passing a function with 4 args instead of 5 for SUF throws a hard to debug message

[danlessa]

If a run a simulation with the following definition, I'll get a TypeError: cannot convert dictionary update sequence element #0 to a sequence error, which can be difficult for point what's the problem with the code.

My suggestion is that we throw a different error, like TypeError: State Update Functions must have 5 positional arguments. The provided function has N positional arguments

f = lambda a, b, c, d: ('variable', None)

partial_state_update_blocks = [
    {
        'policies': {
        },
        'variables': {
            'variable': f
        }
    }
]

[danlessa]

Note: ideally this should be handled before the sim starts. Maybe on the Experiment.append_model method