Strange Character Set Comparison Issue

TestCharsetFixedPlayground.swift

import Foundation

public extension StringProtocol {
    func containsOneOfThese(_ inCharacterset: CharacterSet) -> Bool {
        self.contains { (char) in
            char.unicodeScalars.contains { (scalar) in inCharacterset.contains(scalar) }
        }
    }
    
    func containsOneOfThese(_ inString: String) -> Bool {
        return false
    }
}

let space = " "
let joker = "🃟"
let both = space + joker

let spadesNumberCards = "🂡🂢🂣🂤🂥🂦🂧🂨🂩🂪"
let spadesFaceCards = "🃛🂮🂫🂭"

let testString1 = spadesNumberCards + space + spadesFaceCards
let testString2 = spadesNumberCards + joker + spadesFaceCards
let testString3 = spadesNumberCards + both + spadesFaceCards

print("These Are The Strings We Are Testing:\n")
print("Test String 1: \"\(testString1)\"")
print("Test String 2: \"\(testString2)\"")
print("Test String 3: \"\(testString3)\"")
      
print("\nFirst, See If Any Of the Strings Contain Spaces:\n")
print("Test String 1 does \(testString1.containsOneOfThese(CharacterSet(space.unicodeScalars)) ? "" : "not ")have a space.")
print("Test String 2 does \(testString2.containsOneOfThese(CharacterSet(space.unicodeScalars)) ? "" : "not ")have a space.")
print("Test String 3 does \(testString3.containsOneOfThese(CharacterSet(space.unicodeScalars)) ? "" : "not ")have a space.")

print("\nNext, See If Any Of the Strings Contain Jokers:\n")
print("Test String 1 does \(testString1.containsOneOfThese(CharacterSet(joker.unicodeScalars)) ? "" : "not ")have a joker.")
print("Test String 2 does \(testString2.containsOneOfThese(CharacterSet(joker.unicodeScalars)) ? "" : "not ")have a joker.")
print("Test String 3 does \(testString3.containsOneOfThese(CharacterSet(joker.unicodeScalars)) ? "" : "not ")have a joker.")

print("\nIt Now Works:\n")

print("Test String 1 does \(testString1.containsOneOfThese(CharacterSet(both.unicodeScalars)) ? "" : "not ")have a space or a joker.")
print("Test String 2 does \(testString2.containsOneOfThese(CharacterSet(both.unicodeScalars)) ? "" : "not ")have a space or a joker.")
print("Test String 3 does \(testString3.containsOneOfThese(CharacterSet(both.unicodeScalars)) ? "" : "not ")have a space or a joker.")

TestCharsetPlayground.swift

import Foundation

public extension StringProtocol {
    func containsOneOfThese(_ inCharacterset: CharacterSet) -> Bool {
        self.contains { (char) in
            char.unicodeScalars.contains { (scalar) in inCharacterset.contains(scalar) }
        }
    }
}

let space = " "
let joker = "🃟"
let both = space + joker

let spadesNumberCards = "🂡🂢🂣🂤🂥🂦🂧🂨🂩🂪"
let spadesFaceCards = "🃛🂮🂫🂭"

let testString1 = spadesNumberCards + space + spadesFaceCards
let testString2 = spadesNumberCards + joker + spadesFaceCards
let testString3 = spadesNumberCards + both + spadesFaceCards

print("These Are The Strings We Are Testing:\n")
print("Test String 1: \"\(testString1)\"")
print("Test String 2: \"\(testString2)\"")
print("Test String 3: \"\(testString3)\"")
      
print("\nFirst, See If Any Of the Strings Contain Spaces:\n")
print("Test String 1 does \(testString1.containsOneOfThese(CharacterSet(charactersIn: space)) ? "" : "not ")have a space.")
print("Test String 2 does \(testString2.containsOneOfThese(CharacterSet(charactersIn: space)) ? "" : "not ")have a space.")
print("Test String 3 does \(testString3.containsOneOfThese(CharacterSet(charactersIn: space)) ? "" : "not ")have a space.")

print("\nNext, See If Any Of the Strings Contain Jokers:\n")
print("Test String 1 does \(testString1.containsOneOfThese(CharacterSet(charactersIn: joker)) ? "" : "not ")have a joker.")
print("Test String 2 does \(testString2.containsOneOfThese(CharacterSet(charactersIn: joker)) ? "" : "not ")have a joker.")
print("Test String 3 does \(testString3.containsOneOfThese(CharacterSet(charactersIn: joker)) ? "" : "not ")have a joker.")

print("\nOK, Now it gets weird:\n")
print("Test String 1 does \(testString1.containsOneOfThese(CharacterSet(charactersIn: both)) ? "" : "not ")have a space or a joker.")
print("Test String 2 does \(testString2.containsOneOfThese(CharacterSet(charactersIn: both)) ? "" : "not ")have a space or a joker.")
print("Test String 3 does \(testString3.containsOneOfThese(CharacterSet(charactersIn: both)) ? "" : "not ")have a space or a joker.")