moveTo costCallback error handling
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I just ran into an issue where creep.moveTo would throw an exception; but sadly it was not a real exception, catch would just get an empty object or something like that, which was not helpful at all.
After tinkering around an hour or two I finally figured out that it was apparently caused by some error in the costCallback function I gave it. I'm not quite sure what that error had been, might have been an endless loop or something.
point being: errors in the costCallback function are not very well handled. You might wanna look into that.