Currently Sympl (as of 0.4.0) does not include tracers in input properties. This was done in part for internal reasons, but I'm not convinced this is optimal. If I can find a way around those internal reasons, I think it's better to be explicit and list tracers in the input properties (automatically), the same way they're listed in output properties. Making this issue so I remember to take care of this.
Currently Sympl (as of 0.4.0) does not include tracers in input properties. This was done in part for internal reasons, but I'm not convinced this is optimal. If I can find a way around those internal reasons, I think it's better to be explicit and list tracers in the input properties (automatically), the same way they're listed in output properties. Making this issue so I remember to take care of this.