Some time ago I'd written about how Twitter's descriptions of their own codebase made my hackles rise.
I wasn't alone in this, and one discussion thread on the internal ThoughtWorks dev list later we had some hard numbers extracted from all the Ruby work we've done or are doing.
Martin's put them up on his bliki - take a look. There are the numbers to back the talk - you don't need type checks all over your codebase in Ruby (or any other dynamic language), Alex Payne's opinion notwithstanding.
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