scrollToIndex throwing an exception for very small scroll durations

[D-Raiser]

When passing a duration to scrollToIndex that is smaller than 40µs (basically using it as a jumpTo with index), the call throws the following exception:

I/flutter ( 3806): 'package:flutter/src/widgets/scroll_activity.dart': Failed assertion: line 623 pos 15: 'duration > Duration.zero': is not true.
I/flutter ( 3806): #0      _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:46:39)
I/flutter ( 3806): #1      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:36:5)
I/flutter ( 3806): #2      new DrivenScrollActivity (package:flutter/src/widgets/scroll_activity.dart:623:15)
I/flutter ( 3806): #3      ScrollPositionWithSingleContext.animateTo (package:flutter/src/widgets/scroll_position_with_single_context.dart:181:43)
I/flutter ( 3806): #4      ScrollController.animateTo (package:flutter/src/widgets/scroll_controller.dart:154:68)
I/flutter ( 3806): #5      AutoScrollControllerMixin._scrollToIndex (package:scroll_to_index/scroll_to_index.dart:285:15)

It seems that this happens because the duration passed as a parameter is divided by 40 and the result is then used as the actual duration but there is no documentation why (or whether) this division is necessary