The guidance at https://www.arduino.cc/en/Reference/StepperConstructor
Parameters steps: the number of steps in one revolution of your motor. If your motor gives the number of degrees per step, divide that number into 360 to get the number of steps (e.g. 360 / 3.6 gives 100 steps). (int) pin1, pin2: two pins that are attached to the motor (int) pin3, pin4: optional the last two pins attached to the motor, if it's connected to four pins (int)
I think this is going to confuse people not familiar with steppers as (a) it implies the S+Arduino is connected directly to the stepper and (b) the parameters depend on the number of pins connected to the motor driver NOT the motor.