dispatch to main queue on set

Sources/Defaults/UserDefaults.swift

@@ -10,6 +10,7 @@ extension UserDefaults {
 	}
 
 	 func _set<Value: Defaults.Serializable>(_ key: String, to value: Value) {
+		DispatchQueue.main.async { [self] in
 			if (value as? _DefaultsOptionalProtocol)?._defaults_isNil == true {
 				removeObject(forKey: key)
 				return
@@ -17,6 +18,7 @@ extension UserDefaults {
 
 			set(Value.toSerializable(value), forKey: key)
 		}
+	}
 
 	public subscript<Value: Defaults.Serializable>(key: Defaults.Key<Value>) -> Value {
 		get { _get(key.name) ?? key.defaultValue }