struct constructor doesn't check nested types

[blampe]

I don't think we're recursing into lists/maps to reconstruct the native type:

 def test_constructor_behavior_with_nested_types(loads):
     Struct = loads('''struct Struct {
         1: optional list<string> strings;
     }''').Struct

     with pytest.raises(TypeError) as exc_info:
         Struct(strings=[1])

E   Failed: DID NOT RAISE

[abhinav]

This will be checked during serialization/deserialization.

[blampe]

This makes interacting with the object awkward, though, especially when re-hydrating it from JSON.

[abhinav]

Fair. Although we can't drop validation during serialization because that will just fail with cryptic messages when struct.pack fails. If we're okay with the added cost, I see no problem with doing it in the constructor too.

[abhinav]

Fixed by 0.4.0