"isRTL" was set to the direction value instead of correctly to the boolean flag indicating if it is the actual rtl direction value.
This didn't cause any issues because for ltr because for ltr the result of "scrollAtT0.current[X] - delta[X])" was never less than "-maxScrollPos[X]" and for rtl it always used the expected value since "isRTL" was truthy.
Compared to LTR were the "scrollLeft" value is >= 0, for RTL it's <= 0 which was not handled and thus on applying the inertia effect, "scrollLeft" was always set to 0 due to preventing negative values
