No, i want the equality function run if the two types are equatable, and false 
otherwise (even if you might deem them to be the same, e.g. two identical sets, 
because sets do not conform to equatable, or two identical classes, becauses 
classes are not (in general) equatable).

So
  maybeEqual(3, 3)      // true
  maybeEqual(3, 4)      // false
  maybeEqual([1,2,3], [1,2,3])  // false (because arrays are not actual 
equatable)

  let d = [String:Any]()
  maybeEqual(d, d)      // false because type(d) is not equatable even though 
obviously d is equal to itself




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