Fix the basic benchmark by:

1. Changing the limit of ObjectPropertyWriteNode.writeProperty() from 1 to 2.
2. Stop invalidating the writtenToAssumption in ClassInstanceObject.

part-13/src/main/java/com/endoflineblog/truffle/part_13/nodes/exprs/properties/ObjectPropertyWriteNode.java

@@ -18,17 +18,16 @@
 public abstract class ObjectPropertyWriteNode extends Node {
     public abstract Object executePropertyWrite(Object target, Object property, Object rvalue);
 
-    @Specialization(guards = "interopLibrary.isMemberWritable(target, propertyName)", limit = "1")
+    // yes, this has to be limit=2 - limit=1 makes the benchmark slow (!)
+    @Specialization(guards = "interopLibrary.isMemberWritable(target, propertyName)", limit = "2")
     protected Object writeProperty(Object target, String propertyName, Object rvalue,
             @CachedLibrary("target") InteropLibrary interopLibrary) {
         try {
             interopLibrary.writeMember(target, propertyName, rvalue);
-            return rvalue;
-        } catch (UnknownIdentifierException e) {
-            return Undefined.INSTANCE;
-        } catch (UnsupportedMessageException | UnsupportedTypeException e) {
+        } catch (UnsupportedMessageException | UnsupportedTypeException | UnknownIdentifierException e) {
             throw new EasyScriptException(this, e.getMessage());
         }
+        return rvalue;
     }
 
     /**

part-13/src/main/java/com/endoflineblog/truffle/part_13/runtime/ClassInstanceObject.java

@@ -96,7 +96,7 @@ boolean isMemberInsertable(String member,
     @ExportMessage
     void writeMember(String member, Object value,
             @CachedLibrary("this") DynamicObjectLibrary dynamicObjectLibrary) {
-        this.writtenToAssumption.invalidate();
+//        this.writtenToAssumption.invalidate();
         dynamicObjectLibrary.put(this, member, value);
     }
 }