Restore ObjectCollection

force-app/main/default/classes/collection/ObjectCollection.cls

@@ -0,0 +1,27 @@
+public with sharing class ObjectCollection {
+    private List<Object> objects;
+
+    public static ObjectCollection of(Iterable<Object> objects) {
+        return new ObjectCOllection(objects);
+    }
+
+    private ObjectCollection(Iterable<Object> objects) {
+        this.objects = new List<Object>();
+        Iterator<Object> iter = objects.iterator();
+        while (iter.hasNext()) {
+            this.objects.add(iter.next());
+        }
+    }
+
+    public List<Object> asList(Type listType) {
+        List<Object> typedObjects = (List<Object>) listType.newInstance();
+        typedObjects.addAll(objects);
+        return typedObjects;
+    }
+
+    public Set<Object> asSet(Type setType) {
+        Set<Object> typedObjects = (Set<Object>) setType.newInstance();
+        typedObjects.addAll(objects);
+        return typedObjects;
+    }
+}

force-app/main/default/classes/collection/ObjectCollection.cls-meta.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>58.0</apiVersion>
+    <status>Active</status>
+</ApexClass>

force-app/main/default/classes/collection/SObjectCollection.cls

@@ -388,7 +388,7 @@ public with sharing class SObjectCollection {
 		for (SObject record : records) {
 			mapped.add(fn.call(record));
 		}
-		return new ObjectCollection(mapped);
+		return ObjectCollection.of(mapped);
 	}
 
 	public SObjectCollection mapSome(SObjectPredicate predicate, SObjectToSObjectFunction fn) {