test dict serialization with numeric keys

tests/test_serialization.py

@@ -3,7 +3,7 @@
 from collections import namedtuple
 from dataclasses import dataclass
 from enum import Enum, IntEnum
-from typing import NamedTuple, Sequence, Optional, Mapping, Set, Tuple, Union, Any
+from typing import NamedTuple, Sequence, Optional, Mapping, Set, Tuple, Union, Any, List, Dict
 
 from pytest import raises, fixture
 import yaml
@@ -493,3 +493,22 @@ def test_serialize_none_special_cases_mapping():
     assert len(s) == 1
     assert deserialize(Mapping[str, Optional[int]], s) == m_empty
     assert deserialize(Mapping[str, Optional[int]], serialize(m_empty)) == {}
+
+def test_serialize_dict_with_numeric_keys():
+  d1: Dict[int, List[str]] = {
+    i: [x for x in 'hello world! how are you today?'] for i in range(10)
+  }
+  s1 = serialize(d1)
+  assert deserialize(Dict[int, List[str]], s1) == d1
+
+  j1 = json.dumps(s1)
+  assert deserialize(Dict[int, List[str]], json.loads(j1)) == d1
+
+  d2: Dict[float, List[str]] = {
+    float(i): xs for i, xs in d1.items()
+  }
+  s2 = serialize(d2)
+  assert deserialize(Dict[int, List[str]], s2) == d2
+
+  j2 = json.dumps(s2)
+  assert deserialize(Dict[int, List[str]], json.loads(j2)) == d2