Do not fail with type cast when not needed in reflection.jvm

core/reflection.jvm/src/kotlin/reflect/jvm/KCallablesJvm.kt

@@ -53,7 +53,7 @@ public var KCallable<*>.isAccessible: Boolean
                 javaMethod?.isAccessible ?: true
             is KFunction ->
                 javaMethod?.isAccessible ?: true &&
-                ((this as KCallableImpl<*>).defaultCaller?.member as? AccessibleObject)?.isAccessible ?: true &&
+                ((this as? KCallableImpl<*>)?.defaultCaller?.member as? AccessibleObject)?.isAccessible ?: true &&
                 this.javaConstructor?.isAccessible ?: true
             else -> throw UnsupportedOperationException("Unknown callable: $this ($javaClass)")
         }
@@ -79,7 +79,7 @@ public var KCallable<*>.isAccessible: Boolean
             }
             is KFunction -> {
                 javaMethod?.isAccessible = value
-                ((this as KCallableImpl<*>).defaultCaller?.member as? AccessibleObject)?.isAccessible = true
+                ((this as? KCallableImpl<*>)?.defaultCaller?.member as? AccessibleObject)?.isAccessible = true
                 this.javaConstructor?.isAccessible = value
             }
             else -> throw UnsupportedOperationException("Unknown callable: $this ($javaClass)")

core/reflection.jvm/src/kotlin/reflect/jvm/ReflectJvmMapping.kt

@@ -33,7 +33,7 @@ import kotlin.reflect.jvm.internal.KTypeImpl
  * or `null` if the property has no backing field.
  */
 public val KProperty<*>.javaField: Field?
-    get() = (this as KPropertyImpl<*>).javaField
+    get() = (this as? KPropertyImpl<*>)?.javaField
 
 /**
  * Returns a Java [Method] instance corresponding to the getter of the given property,