Fixed comparison process.

Author: k163377

src/main/kotlin/com/fasterxml/jackson/module/kotlin/KotlinValueInstantiator.kt

@@ -201,8 +201,15 @@ internal class KotlinInstantiators(
         defaultInstantiator: ValueInstantiator
     ): ValueInstantiator {
         return if (beanDescriptor.beanClass.isKotlinClass()) {
-            if (defaultInstantiator is StdValueInstantiator) {
-                KotlinValueInstantiator(defaultInstantiator, cache, nullToEmptyCollection, nullToEmptyMap, nullIsSameAsDefault, strictNullChecks)
+            if (defaultInstantiator::class == StdValueInstantiator::class) {
+                KotlinValueInstantiator(
+                    defaultInstantiator as StdValueInstantiator,
+                    cache,
+                    nullToEmptyCollection,
+                    nullToEmptyMap,
+                    nullIsSameAsDefault,
+                    strictNullChecks
+                )
             } else {
                 // TODO: return defaultInstantiator and let default method parameters and nullability go unused?  or die with exception:
                 throw IllegalStateException("KotlinValueInstantiator requires that the default ValueInstantiator is StdValueInstantiator")