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XXX TODO: description of the role of scalar evaluators and the connection to Heuristic

g-value evaluator

Returns the g-value (path cost) of the search node.

g()

Preference evaluator

Returns 0 if preferred is true and 1 otherwise.

pref()

Sum evaluator

Calculates the sum of the sub-evaluators.

sum(evals)

Weighted evaluator

Multiplies the value of the scalar evaluator with the given weight.

weight(eval, weight)