Add handling of DynamicObject

test/object.capnp

@@ -0,0 +1,21 @@
+@0x8186ddb142b58556;
+
+struct Person {
+  id @0 :UInt32;
+  name @1 :Text;
+}
+
+struct Place {
+  id @0 :UInt32;
+  name @1 :Text;
+}
+
+struct Thing {
+  id @0 :UInt64;
+  value @1 :UInt64;
+}
+
+struct TestObject {
+  object @0 :Object;
+}
+

test/test_object.py

@@ -0,0 +1,25 @@
+import pytest
+import capnp
+import os
+import math
+
+this_dir = os.path.dirname(__file__)
+
+@pytest.fixture
+def object():
+     return capnp.load(os.path.join(this_dir, 'object.capnp'))
+
+def test_object_basic(object):
+    obj = object.TestObject.new_message()
+    person = obj.object.as_struct(object.Person)
+    person.name = 'test'
+    person.id = 1000
+
+    same_person = obj.object.as_struct(object.Person)
+    assert same_person.name == 'test'
+    assert same_person.id == 1000
+
+    obj_r = obj.as_reader()
+    same_person = obj_r.object.as_struct(object.Person)
+    assert same_person.name == 'test'
+    assert same_person.id == 1000