tweak tests and comment

src/validators/literal.rs

@@ -136,9 +136,9 @@ impl<T: Debug> LiteralLookup<T> {
         }
         // must be an enum or bytes
         if let Some(expected_py) = &self.expected_py {
-            // We don't use ? to unpack the result of get_item in the next line because unhashable
-            // inputs will produce a TypeError, which in this case we just want to treat as a
-            // validation failure
+            // We don't use ? to unpack the result of `get_item` in the next line because unhashable
+            // inputs will produce a TypeError, which in this case we just want to treat equivalently
+            // to a failed lookup
             if let Ok(Some(v)) = expected_py.as_ref(py).get_item(input) {
                 let id: usize = v.extract().unwrap();
                 return Ok(Some((input, &self.values[id])));

tests/validators/test_union.py

@@ -799,5 +799,7 @@ class ModelA:
 
     # validation against Literal[True] fails bc of the unhashable dict
     # A ValidationError is raised, not a ValueError, which allows the validation against the union to continue
-    assert validator.validate_python({'a': 42})
-    assert validator.validate_python(True)
+    m = validator.validate_python({'a': 42})
+    assert isinstance(m, ModelA)
+    assert m.a == 42
+    assert validator.validate_python(True) is True