[Haskell-cafe] Re: How to check object's identity?

Lauri Alanko wrote:

Personally, I find the idea appealing (and have implemented the Refs in the paper with IORefs and unsafePerformIO), because really, even currently a programmer has to care about sharing since it can have radical implications for performance and memory usage. Making it observable in the program would just mean acknowledging the fact that in real-world programming, you can't _really_ replace a variable with its definition without changing its behavior in important ways.

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