# File lib/core/message.rb, line 277
    def delivery_count=(count)
      raise ::ArgumentError.new("invalid count: #{count}") if count.nil? || !([Float, Fixnum].include?(count.class))
      raise RangeError.new("count out of range: #{count}") if count < 0

      Cproton.pn_message_set_delivery_count(@impl, count.floor)
    end