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1970  * Costs are factors >= 1.0 indicating the relative decoding costs of a
1971 * filter type. Higher costs indicate more decoding expense, and are
1973 * costs. There needs to be a value in "filter_costs" for each valid filter
1975 * setting the costs. Costs try to improve the speed of decompression without
1980 * The default values for both weights and costs are currently 1.0, but may
1982 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method