This was one the breaking changes between Python 2 and 3. In Python 3, / always does floating-point division, and // is the integer quotient operator. If one were going to design their own language, I would say that making division and quotient be spelled differently is a better design choice than following C or Python 2's example of spelling them the same, so that 1/2 is either a type error or implicitly promotes to a fractional type, but alas, like Chris said it's too late for us to seriously consider that for Swift.
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