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<https://docs.prefect.io/core/concepts/tasks.html#operators> indicates that this happens, but not which operators are available. I am guessing that `+` is defined as something like this in the Flow Context:
           `lambda(x:Parameter, y:Parameter) Task("Add". lambda()(x.value + y.value))`

Got it. Parameter.add is what returns the task named "Add". Should have realized that there is no magic. Just need to get a list of the operators covered.

Operations defined for parameters: __add__, __and__, __floordiv__, __ge__, __getitem__, __gt__, __hash__, __le__, __lt__, __mod__, __mul__, __or__, __pow__, __rand__, __sub__, __truediv__.
Not sure how == is handled between Parameters.

Yeah, if x and y are Parameters, x == y does not compare the values. So don't use == in a condition of an ifelse.

For that one, <https://docs.prefect.io/api/latest/tasks/control_flow.html#case|case statements >come in handy.