You could also patch Object rather than TrueClass and add a similar implementation for NilClass to emulate Ruby own truthiness rules. Personally, I would probably tweak my implementation somewhat to allow it to be used as an expression returning the value of the given block; I not sure offhand exactly how I implement this, though, so I left it in the form given in the talk.As to performance, I couldn say specifically, but I can imagine this would perform significantly worse than if in Ruby specifically. YMMV in other languages.A single pass over the array converting everything to strings, which meant they needed to anti theft backpack create a whole new array increasing memory costs (unless of course things are casted on the fly, in which case you now have N logN casts instead of N, but i doubt that)They most likely copy the original array, then replace each element with the casted version as it acquired.
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