Parametricity directly attacks this cost. When a function is parametric its type signature is not just a hint about the implementation, but a language-enforced constraint on what the function can possibly do. We don't need to read the body, check the tests, or trust that the name is accurate, to understand properties of the function. The types are a proof, which gives theorems for free1.
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The complete map has thousands of tiles and decorations. Drawing each one individually would kill the frame rate. The solution is two-fold:
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