protected final Set<Property> aquireSet(Verb verb) {
        requireNonNull(verb);
        return streamImpacts.computeIfAbsent(verb, v -> EnumSet.noneOf(Property.class));
    }
@param <T>  input {@code BaseStream} type
@param <R>  output (return) {@code BaseStream} type

@author  Per Minborg
@since   2.1.0
runtime-parent/runtime-core/src/main/java/com/speedment/runtime/core/stream/action/Action.java