"The first type systems in computer science, beginning in the 1950s in languages such as Fortran, were introduced to improve the efficiency of numerical calculations by distinguishing between integer-valued arithmetic expressions and real-valued ones; this allowed the compiler to use different representations and generate appropriate machine instructions for primitive operations."
I've been reading Pierce's Types and Programming Languages. I've become interested in the interactions between Parametric Polymorphism and runtime efficiency. I do have a interesting (to me :-) point at the end, but it takes a lot of introduction...
rest of my article here
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