Comparing numeric evaluations
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As tied objects acquire numeric values, default productions compare the
values to decide which object is better.  The productions must be told
whether to prefer higher or lower values.  This is done by augmenting the
desired object of the goal *above the selection subgoal* with either ^better
higher or ^better lower, respectively.

By default, objects that have equal numeric values are made indifferent
(regardless of the ^better augmentation).  This can be changed by augmenting
the desired object with ^equal not-indifferent. If equal values are not made
indifferent, and the tie is not otherwise broken, then a second tie impasse
will arise in the original context, between the equal-valued objects.