🐛 fix(py_info): preserve supplied JSON keys

docs/changelog/+property-keys.bugfix.rst

@@ -0,0 +1 @@
+Preserve interpreter-provided values when answer keys match computed properties during cache serialization.

src/python_discovery/_py_info.py

@@ -357,7 +357,7 @@ def to_json(self) -> str:
 
     def to_dict(self) -> dict[str, InfoValue]:
         """Convert this interpreter information to a plain dictionary."""
-        data = {var: (getattr(self, var) if var != "_creators" else None) for var in vars(self)}
+        data = {name: None if name == "_creators" else value for name, value in vars(self).items()}
         version_info = data["version_info"]
         data["version_info"] = version_info._asdict() if hasattr(version_info, "_asdict") else version_info
         return data

tests/py_info/test_py_info.py

@@ -485,6 +485,12 @@ def test_py_info_to_dict_includes_sysconfig_platform() -> None:
     assert data["sysconfig_platform"] == sysconfig.get_platform()
 
 
+def test_py_info_to_dict_preserves_property_named_answer_key() -> None:
+    data = CURRENT.to_dict()
+    data["system_include"] = "supplied path"
+    assert PythonInfo.from_dict(data).to_dict()["system_include"] == "supplied path"
+
+
 def test_py_info_json_round_trip() -> None:
     json_str = CURRENT.to_json()
     parsed = json.loads(json_str)