I tried using Marshal with my RubyExcel gem in IRB, and I got these 
warnings:

(irb):6: warning: RubyExcel::Sheet#respond_to?(:marshal_dump) is old 
fashion which takes only one parameter
C:/splice/bin/RubyExcel/lib/lib/rubyexcel/sheet.rb:430: warning: 
respond_to? is defined here

My Google search didn't turn up anything particularly relevant. Is this 
warning part of IRB, Marshal... Ruby interpreter?

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