refactor(rust): parse env boolean with pydantic

litellm/rust_bridge/configuration.py

@@ -6,9 +6,11 @@ from enum import Enum
 from types import MappingProxyType
 from typing import Final
 
+from pydantic import TypeAdapter
+
 DEFAULT_RUST_ENABLED: Final = False
-_TRUE_ENV_VALUES: Final = frozenset({"1", "true", "yes", "on"})
 _GLOBAL_ENV_NAME: Final = "LITELLM_RUST"
+_ENV_BOOL: Final = TypeAdapter(bool)
 
 
 class RouteName(str, Enum):
@@ -65,7 +67,7 @@ _CONFIGURATION: Final = _RustConfiguration()
 def _parse_env_bool(value: str | None) -> bool | None:
     if value is None:
         return None
-    return value.strip().lower() in _TRUE_ENV_VALUES
+    return _ENV_BOOL.validate_python(value.strip())
 
 
 def resolve_rust_enabled(

tests/test_litellm/rust_bridge/test_configuration_env.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+import pytest
+from pydantic import ValidationError
+
+from litellm.rust_bridge.configuration import (
+    _parse_env_bool,  # pyright: ignore[reportPrivateUsage]  # directly test env parsing contract
+)
+
+
+@pytest.mark.parametrize("value", ("1", "true", "t", "yes", "y", "on", "TRUE", " yes "))
+def test_parse_env_bool_accepts_standard_true_values(value: str) -> None:
+    assert _parse_env_bool(value) is True
+
+
+@pytest.mark.parametrize("value", ("0", "false", "f", "no", "n", "off", "FALSE", " no "))
+def test_parse_env_bool_accepts_standard_false_values(value: str) -> None:
+    assert _parse_env_bool(value) is False
+
+
+def test_parse_env_bool_preserves_unset_value() -> None:
+    assert _parse_env_bool(None) is None
+
+
+def test_parse_env_bool_rejects_unknown_value() -> None:
+    with pytest.raises(ValidationError):
+        _parse_env_bool("enabled")