I would like to give some feedback about ...

From: https://js.checkio.org/mission/fast-train/solve/

HTTP_USER_AGENT: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

Hi you have miscalculation in test, for '[[8,3],[1,1],[8,3]] right answer is 10 not 9'

from 0 to 1 == 1;

from 1 to 2 == 3;

from 2 to 2 == 5;

from 2 to 2 == 7;

from 2 to 1 == 8; firs done; 5 steps;

form 1 to 1 ==1 ; second done; 1 step;

from 1 to 2 == 2;

from 2 to 3 == 5;

from 3 to 2 == 7;

from 2 to 1 == 8; third done 4 steps ;

5+1+4 ==10 steps;