From 5434b04cb418a6975b5d149edb9ae1da4eb0d9a9 Mon Sep 17 00:00:00 2001
From: Sindre Sorhus <sindresorhus@gmail.com>
Date: Tue, 11 Jun 2024 16:12:24 +0200
Subject: [PATCH] Work around Swift bug in Xcode 16

---
 Sources/Defaults/Defaults.swift     |  2 +-
 Sources/Defaults/UserDefaults.swift |  2 +-
 Sources/Defaults/Utilities.swift    | 11 +++++++++++
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/Sources/Defaults/Defaults.swift b/Sources/Defaults/Defaults.swift
index 1cb2ee7..0930039 100644
--- a/Sources/Defaults/Defaults.swift
+++ b/Sources/Defaults/Defaults.swift
@@ -126,7 +126,7 @@ extension Defaults {
 
 			super.init(name: name, suite: suite)
 
-			if (defaultValue as? _DefaultsOptionalProtocol)?._defaults_isNil == true {
+			guard !isNil(defaultValue) else {
 				return
 			}
 
diff --git a/Sources/Defaults/UserDefaults.swift b/Sources/Defaults/UserDefaults.swift
index 5e1bc2f..11a3433 100644
--- a/Sources/Defaults/UserDefaults.swift
+++ b/Sources/Defaults/UserDefaults.swift
@@ -10,7 +10,7 @@ extension UserDefaults {
 	}
 
 	 func _set<Value: Defaults.Serializable>(_ key: String, to value: Value) {
-		if (value as? _DefaultsOptionalProtocol)?._defaults_isNil == true {
+		guard !isNil(value) else {
 			removeObject(forKey: key)
 			return
 		}
diff --git a/Sources/Defaults/Utilities.swift b/Sources/Defaults/Utilities.swift
index 07a871f..08872da 100644
--- a/Sources/Defaults/Utilities.swift
+++ b/Sources/Defaults/Utilities.swift
@@ -458,3 +458,14 @@ func runtimeWarn(
 #endif
 #endif
 }
+
+
+@usableFromInline
+func isNil(_ value: Any) -> Bool {
+	switch value {
+	case Optional<Any>.none:
+		return true
+	default:
+		return false
+	}
+}