Fixed build error with Realm v10.21.0

Unrealm.podspec

@@ -9,7 +9,7 @@
 Pod::Spec.new do |s|
   s.name             = 'Unrealm'
   s.swift_version    = '5.5'
-  s.version          = '1.9.3'
+  s.version          = '1.9.4'
   s.summary          = 'Unrealm is an extension on RealmCocoa, which enables Swift native types to be saved in Realm.'
   s.description      = <<-DESC
 Unrealm enables you to easily store Swift native Classes, Structs and Enums into Realm.

Unrealm/Classes/Swift/Results.swift

@@ -148,7 +148,7 @@ extension Results {
 
 	- parameter property: The name of a property whose minimum value is desired.
 	*/
-	public func min<T: MinMaxType>(ofProperty property: String) -> T? {
+    public func min<T: _HasPersistedType>(ofProperty property: String) -> T? where T.PersistedType: MinMaxType {
 		return rlmResult.min(ofProperty: property)
 	}
 
@@ -159,7 +159,7 @@ extension Results {
 
 	- parameter property: The name of a property whose minimum value is desired.
 	*/
-	public func max<T: MinMaxType>(ofProperty property: String) -> T? {
+	public func max<T: _HasPersistedType>(ofProperty property: String) -> T? where T.PersistedType: MinMaxType {
 		return rlmResult.max(ofProperty: property)
 	}
 
@@ -170,7 +170,7 @@ extension Results {
 
 	- parameter property: The name of a property whose values should be summed.
 	*/
-	public func sum<T: AddableType>(ofProperty property: String) -> T {
+	public func sum<T: _HasPersistedType>(ofProperty property: String) -> T where T.PersistedType: AddableType {
 		return rlmResult.sum(ofProperty: property)
 	}
 
@@ -181,7 +181,7 @@ extension Results {
 
 	- parameter property: The name of a property whose average value should be calculated.
 	*/
-	public func average<T: AddableType>(ofProperty property: String) -> T? {
+	public func average<T: _HasPersistedType>(ofProperty property: String) -> T? where T.PersistedType: AddableType {
 		return rlmResult.average(ofProperty: property)
 	}
 }