LambdaRestrictionStrategy and LambdaMapStep in `by()`-modulation.

gremlin> g.V().groupCount().by(label).order(local).by(values)
The provided step contains a lambda comparator: OrderLocalStep([[[LambdaMapStep(values)@[~gremlin.incidentToAdjacent, ~gremlin.pathRetraction]], incr]])
Type ':help' or ':h' for help.
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