sclass SignalWithStrength {
  settable S type;
  
  settable S reason;
  
  // zero = no signal, one = full signal
  // can be outside of [0; 1] too
  settable double strength;
  
  settable O createdBy;
  
  toString {
    ret or2(type, "Unspecified ") + " signal "
      + appendRoundBracketed(
        commaCombine(reason, iround(strength*100) + "%")
      );
  }
  
  bool isTrigger() { ret strength >= 1; }
}