Perform loose isa check

README.md

@@ -81,9 +81,41 @@ app.activateIgnoringOtherApps(true)
 
 alert = ObjRuby::NSAlert.new
 alert.messageText = "Hello world!"
+
 alert.runModal
 ```
 
+Subclasses of `ObjRuby::NSObject` can also be used for delegates such as NSApplicationDelegate.
+
+``` ruby
+require "obj_ruby"
+require "obj_ruby/app_kit"
+
+# NSApplicationDelegate
+class AppDelegate < ObjRuby::NSObject
+  def applicationShouldTerminateAfterLastWindowClosed(_)
+    true
+  end
+end
+
+app = ObjRuby::NSApplication.sharedApplication
+app.activationPolicy = ObjRuby::NSApplicationActivationPolicyRegular
+app.delegate = AppDelegate.new
+
+window = ObjRuby::NSWindow.alloc.initWithContentRect_styleMask_backing_defer(
+  ObjRuby::NSMakeRect(0, 0, 300, 200),
+  ObjRuby::NSTitledWindowMask | ObjRuby::NSWindowStyleMaskClosable,
+  ObjRuby::NSBackingStoreBuffered,
+  false
+)
+window.cascadeTopLeftFromPoint(ObjRuby::NSMakePoint(20, 20))
+window.title = "Hello, from ObjRuby!"
+window.makeKeyAndOrderFront(nil)
+
+app.activateIgnoringOtherApps(true)
+app.run
+```
+
 For more examples, see this projects [spec](https://github.com/keegnotrub/obj-ruby/tree/main/spec) folder.
 
 ## Credit

ext/obj_ext/RIGSCore.h

@@ -28,8 +28,8 @@
 #include <dlfcn.h>
 #include <ffi/ffi.h>
 
-BOOL rb_objc_convert_to_objc(VALUE rb_val, void **data, size_t offset, const char *type);
-BOOL rb_objc_convert_to_rb(void *data, size_t offset, const char *type, VALUE *rb_val_ptr);
+void rb_objc_convert_to_objc(VALUE rb_val, void **data, size_t offset, const char *type);
+void rb_objc_convert_to_rb(void *data, size_t offset, const char *type, VALUE *rb_val_ptr);
 
 BOOL rb_objc_register_framework_from_objc(char *framework, const char *root);