Yes, Intervals.icu translates fixed power (and other) targets into a range. For power this is only done for outdoor workouts. The default range for power and pace is 2.5%. For HR it is 1.5%. If the athlete has changed Garmin stuff in /settings then these are the defaults:
You can also supply powerRange, hrRange and paceRange query parameters to the call (e.g. powerRange=5.0) for 5%. Use 0.0 to disable range. I am going to update the docs.
Devices beep and so on if you aren’t in the range and this is impossible outdoors and for HR and pace if there isn’t some spread.
I have added these fields to workout_doc and will deploy Thurs AM (GMT+2):
public Integer lthr;
public Float threshold_pace;
public String pace_units;