Running:
./downward --heuristic "h=lmcut()" --search "eager(tiebreaking(sum(g(), h), h,
unsafe_pruning=false), reopen_closed=true, f_evaluator=h )" < output
passes an f_evaluator of NULL to the search.
Also, the equivalent to A* should have f_evaluator=sum(g(), h) [this is from
the online documentation]
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