What are the trade offs between ffi and mri c extensions in ruby?
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One obvious tradeoff is that MRI C extensions only work on MRI, whereas FFI extensions work on MRI, YARV, Rubinius and JRuby at the moment, and will in the future probably also work on IronRuby, MagLev, MacRuby, SmallRuby, tinyrb and RubyGoLightly.