def to_a
      Sass::Util.intersperse(queries.map {|q| q.to_a}, ', ').flatten
    end
def to_a
      Sass::Util.intersperse(queries.map {|q| q.to_a}, ', ').flatten
    end
Returns a representation of the query as an array of strings and
 potentially {Sass::Script::Tree::Node}s (if there's interpolation in it).
 When the interpolation is resolved and the strings are joined together,
 this will be the string representation of this query.

 @return [Array<String, Sass::Script::Tree::Node>]