miscalculation in test fast train

I would like to give some feedback about ...

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

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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;