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Extend the example in “The Swift Programming Language” (Swift 5.5) “Integer and Floating-Point Conversion”: 3 + 0.14 // allowed let three = 3 let rest = 0.14 3 + rest // allowed 0.14 + three // compile error three + 0.14 // compile error I don’t understand why the last two lines are taken as compile error. Can anyone help to explain a bit? Thanks.