Sequence extension with class having generic types

SomeType.swift

import Foundation

struct SomeType<T> {
  let property: T
}

extension Sequence {
  func doMagic<T>() -> [T] where Element == SomeType<T>  {
    return self.map { $0.property }
  }
}

// Use ---------

let stringType1 = SomeType(property: "Hello")
let stringType2 = SomeType(property: "World")
let stringSequence = [stringType1, stringType2]
stringSequence.doMagic()

let intType1 = SomeType(property: 123)
let intType2 = SomeType(property: 456)
let intSequence = [intType1, intType2]
intSequence.doMagic()