Feature Request: Add MANUAL_STEPPER to GET_POSITION call

I want to be able to test to see if my MANUAL_STEPPER has lost steps.

I was planning on using the method used by Andrew Ellis’s TEST_SPEED macro : Determining Maximum Speeds and Accelerations | Ellis’ Print Tuning Guide which uses a before and after comparison using GET_POSITION to see if steps were lost or skipped during a series of movements.

However, GET_POSITION does not work for MANUAL_STEPPERS. It would be nice if it did in my application. Is there another way to see if my MANUAL_STEPPER has lost steps after a series of moves?