还是一个练习，if next_move.is_a?(Numeric)== true 这个我输入任意数字，他都跳转到了 dead 去，是哪里写错了吗？

def gold_room()
    puts "This room is full of gold. How much do you take?"

    prompt
    next_move = gets.chomp
    if next_move.is_a?(Numeric)== true
        how_much=next_move.to_i()
    else
        dead("Man,learn to type a number.")
    end

    if how_much<50
        puts "Nice,you're not greedy,you win!"
        Process.exit(0)
    else
        dear("You greedy bastard!")
    end
end