# File lib/core/message.rb, line 235
    def delivery_count=(count)
      raise ::ArgumentError.new("invalid count: #{count}") if not count.is_a?(Numeric)
      raise RangeError.new("count out of range: #{count}") if count < 0
      Cproton.pn_message_set_delivery_count(@impl, count.floor)
    end