Initial review

jsonschema/exceptions.py

@@ -4,7 +4,7 @@
 from __future__ import annotations
 
 from collections import defaultdict, deque
-from collections.abc import Iterable
+from collections.abc import Iterable, Mapping
 from pprint import pformat
 from textwrap import dedent, indent
 from typing import TYPE_CHECKING, Any
@@ -37,8 +37,8 @@ def __init__(
         cause: Exception | None = None,
         context=(),
         validator_value=_unset,
-        instance: dict[str, Any] | _utils.Unset = _unset,
-        schema: dict[str, Any] | _utils.Unset = _unset,
+        instance: Any = _unset,
+        schema: Mapping[str, Any] | bool | _utils.Unset = _unset,
         schema_path: Iterable[str | int] = (),
         parent: _Error | None = None,
         type_checker: _types.TypeChecker | _utils.Unset = _unset,
@@ -160,11 +160,8 @@ def _contents(self):
         return dict((attr, getattr(self, attr)) for attr in attrs)
 
     def _matches_type(self) -> bool:
-        if isinstance(self.schema, _utils.Unset):
-            return False
-
         try:
-            expected = self.schema["type"]
+            expected = self.schema["type"]  # type: ignore[index] # We crash if it's not a dict
         except (KeyError, TypeError):
             return False