Existential equality

equals.swift

public func equals(_ lhs: Any, _ rhs: Any) -> Bool {
  func open<A: Equatable>(_ lhs: A, _ rhs: Any) -> Bool {
    type(of: rhs) == A.self && lhs == (rhs as? A)
  }

  guard let lhs = lhs as? any Equatable else { return false }

  return open(lhs, rhs)
}