Why does Rhs2116StimulusTrigger take "double" instead of "bool"?

[cjsha]

I'm wondering why Rhs2116StimulusTrigger takes "double" instead of "bool" as the type of its input observable.

For reference, Headstage64ElectricalStimulatorTrigger and Headstage64OpticalStimulatorTrigger do take "bool" as their input observable type. I prefer how the hs64 does it because the graph for triggering in the example workflow can be more simple.