[Someone]

Swift does that for integers, floats and doubles, too. https://docs.swift.org/swift-book/documentation/the-swift-pr...:

“Conversions between integer and floating-point numeric types must be made explicit:

  let three = 3
  let pointOneFourOneFiveNine = 0.14159
  let pi = Double(three) + pointOneFourOneFiveNine
  // pi equals 3.14159, and is inferred to be of type Double

“