def get(value)
      propagate = value[:w] || value["w"]
      if propagate == 0 || propagate == -1
        Unverified.new
      else
        Propagate.new(value)
      end
    end
def get(value)
      propagate = value[:w] || value["w"]
      if propagate == 0 || propagate == -1
        Unverified.new
      else
        Propagate.new(value)
      end
    end
Get the corresponding write concern for the provided value. If the value
 is unverified we get that concern, otherwise we get propagate.

 @example Get the appropriate write concern.
   Moped::WriteConcern.get(w: 3)

 @param [ Symbol, String, Hash ] The value to use to get the concern.

 @return [ Unverified, Propagate ] The appropriate write concern.

 @since 2.0.0