What's new in GSON 2.0

GSON 1.x used to automatically unwrap single-element arrays as necessary.
GSON 2.x doesn't.
com.google.gson.functional.ArrayTest.testSingleStringArrayDeserialization


GSON 1.x permitted primitive types to be overridden
GSON 2.x doesn't.
com.google.gson.functional.ArrayTest.testArrayOfPrimitivesWithCustomTypeAdapter