JsonReader not strict about JSON document consumption

[NightlyNexus]

Say I have a class:
final class MyType {}

and a TypeAdapter:

final class MyTypeAdapter extends TypeAdapter<MyType> {
  // ...
  @Override public MyType read(JsonReader in) throws IOException {
    in.beginObject();
    return new MyType();
    }
}

Note the missing in.endObject() call.

My calling code:

String json = "{}";
Gson gson = new GsonBuilder().registerTypeAdapter(MyType.class, new MyTypeAdapter()).create();
StringReader stringReader = new StringReader(json);
MyType myType = gson.fromJson(stringReader, MyType.class);

The above will correctly fail (JsonIOException: JSON document was not fully consumed.).

However, using a JsonReader instead (gson.fromJson(new JsonReader(stringReader), MyType.class)) will not fail.
Is this working as intended?

[JakeWharton]

If you are passing a JsonReader instance then it's your responsibility to do the assertion.

The implementation of fromJson(String, Class<?>) is:

JsonReader jsonReader = newJsonReader(json);
Object object = fromJson(jsonReader, classOfT);
assertFullConsumption(object, jsonReader);
return object;

In the case where you are the one creating the JsonReader there's no opportunity to assert completion since you may just be deserializing part of the whole document.

[NightlyNexus]

Oh, yes, I should have dug one step deeper into that. Thanks. Makes sense.