Treat intersections of only objects as a single object in relations

Author: ahejlsberg

src/compiler/checker.ts

@@ -15363,7 +15363,9 @@ namespace ts {
                         //
                         //    - For a primitive type or type parameter (such as 'number = A & B') there is no point in
                         //          breaking the intersection apart.
-                        result = someTypeRelatedToType(<IntersectionType>source, target, /*reportErrors*/ false, IntersectionState.Source);
+                        if (!isNonGenericObjectType(target) || !every((<IntersectionType>source).types, isNonGenericObjectType)) {
+                            result = someTypeRelatedToType(<IntersectionType>source, target, /*reportErrors*/ false, IntersectionState.Source);
+                        }
                     }
                     if (!result && (source.flags & TypeFlags.StructuredOrInstantiable || target.flags & TypeFlags.StructuredOrInstantiable)) {
                         if (result = recursiveTypeRelatedTo(source, target, reportErrors, intersectionState)) {