Add --local-partial-types and --strict-bytes to mypy (#4583)

.pre-commit-config.yaml

@@ -39,13 +39,14 @@ repos:
         exclude: ^src/blib2to3/
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.14.1
+    rev: v1.15.0
     hooks:
       - id: mypy
         exclude: ^(docs/conf.py|scripts/generate_schema.py)$
         args: []
         additional_dependencies: &mypy_deps
           - types-PyYAML
+          - types-atheris
           - tomli >= 0.2.6, < 2.0.0
           - click >= 8.1.0, != 8.1.4, != 8.1.5
           - packaging >= 22.0

pyproject.toml

@@ -224,6 +224,8 @@ branch = true
 python_version = "3.9"
 mypy_path = "src"
 strict = true
+strict_bytes = true
+local_partial_types = true
 # Unreachable blocks have been an issue when compiling mypyc, let's try to avoid 'em in the first place.
 warn_unreachable = true
 implicit_reexport = true

scripts/fuzz.py

@@ -80,7 +80,7 @@ def test_idempotent_any_syntatically_valid_python(
     try:
         import sys
 
-        import atheris  # type: ignore[import-not-found]
+        import atheris
     except ImportError:
         pass
     else: