From: Daniel DeLorme <dan-ml@...42.com>
Date: 2006-08-10T21:23:21+09:00
Subject: Re: extending String call with a #copy!(n)

Alex Young wrote:
>> Use << (or concat).
>>
> or sub!.

replace would be more efficient:
class String
   alias copy *
   def copy!(n)
     replace(self*n)
   end
end