codeconsole commented on code in PR #16209:
URL: https://github.com/apache/grails-core/pull/16209#discussion_r3845920076


##########
grails-web-databinding/src/main/groovy/grails/web/databinding/GrailsWebDataBinder.groovy:
##########
@@ -545,7 +545,17 @@ class GrailsWebDataBinder extends SimpleDataBinder {
                                 }
                             }
                             if (persistentInstance == null) {
-                                if (item instanceof Map || item instanceof 
DataBindingSource) {
+                                if (item == null || 
referencedType.isAssignableFrom(item.getClass())) {

Review Comment:
   ```
   BEFORE 548:  if (item == null || 
referencedType.isAssignableFrom(item.getClass())) {
   AFTER  548:  if (item == null || referencedType.isAssignableFrom((Object) 
item.getClass())) {
   
   GrailsWebDataBinder.groovy: 548: [Static type checking] -
       Cannot find matching method 
java.lang.Class#isAssignableFrom(java.lang.Object).
   1 error
   BUILD FAILED
   ```
   



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