#buildinpublic There are unicode for ≈, ≉, ≲, ≳. You can do this in Swift.
protocol ApproximatelyEquatable {
static func ≈ (lhs: Self, rhs: Self) -> Bool
}
extension ApproximatelyEquatable {
static func ≉ (lhs: Self, rhs: Self) -> Bool {
false == lhs ≈ rhs
}
}