public TsRank(TsVector tsVector, TsQuery tsQuery, FullTextNormalization normalization) : this(null, tsVector, tsQuery, normalization) { }
public TsRank(double[] weights, TsVector tsVector, TsQuery tsQuery, FullTextNormalization normalization) : this(weights, tsVector, tsQuery, (FullTextNormalization?)normalization) { }