How to use Objective-C Generics with -isKindOfClass:

GenericIsKindOfClass.m

#import "MyNonClusteredClass.h"

@interface GenericIsKindOfClass<ObjectType : MyNonClusteredClass *> : NSObject

+ (instancetype _Nonnull)new NS_UNAVAILABLE;
- (instancetype _Nonnull)init NS_UNAVAILABLE;
- (instancetype _Nonnull)initWithInstanceOfObjectType:(ObjectType _Nonnull)instanceOfObjectType NS_DESIGNATED_INITIALIZER;

- (ObjectType _Nullable)typeSafeDowncastOrNil:(NSObject * _Nonnull)object;

@end

@implementation GenericIsKindOfClass {
  MyNonClusteredClass * _Nonnull _instanceOfObjectType;
}

- (instancetype _Nonnull)initWithInstanceOfObjectType:(MyNonClusteredClass * _Nonnull)instanceOfObjectType {
  NSParameterAssert(instanceOfObjectType);
  self = [super init];
  if (self) {
    _instanceOfObjectType = instanceOfObjectType;
  }
  
  return self;
}

- (ObjectType _Nullable)typeSafeDowncastOrNil:(NSObject * _Nonnull)object {
  if ([object isKindOfClass:[[_instanceOfObjectType class]]) {
    return (MyNonClusteredClass * _Nonnull) object;
  } else {
    return nil;
  }
}

@end