fix mypy/flake8 findings

2 files changed, 10 insertions, 5 deletions

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index d41d19f..c3cc888 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -12,7 +12,6 @@ repos:
     hooks:
       - id: reorder-python-imports
         args: ["--application-directories", "src:tests"]
-        additional_dependencies: ["setuptools>60.9"]
   - repo: https://github.com/psf/black
     rev: 22.12.0
     hooks:
@@ -21,7 +20,9 @@ repos:
     rev: 6.0.0
     hooks:
       - id: flake8
-        additional_dependencies: [flake8-bugbear]
+        additional_dependencies:
+          - flake8-bugbear
+          - flake8-implicit-str-concat
   - repo: https://github.com/peterdemin/pip-compile-multi
     rev: v2.6.1
     hooks:
diff --git a/src/itsdangerous/serializer.py b/src/itsdangerous/serializer.py
index 9f4a84a..1a66789 100644
--- a/src/itsdangerous/serializer.py
+++ b/src/itsdangerous/serializer.py
@@ -212,7 +212,9 @@ class Serializer:
 
         return rv
 
-    def dump(self, obj: _t.Any, f: _t.IO, salt: _t_opt_str_bytes = None) -> None:
+    def dump(
+        self, obj: _t.Any, f: _t.IO[_t.Any], salt: _t_opt_str_bytes = None
+    ) -> None:
         """Like :meth:`dumps` but dumps into a file. The file handle has
         to be compatible with what the internal serializer expects.
         """
@@ -235,7 +237,7 @@ class Serializer:
 
         raise _t.cast(BadSignature, last_exception)
 
-    def load(self, f: _t.IO, salt: _t_opt_str_bytes = None) -> _t.Any:
+    def load(self, f: _t.IO[_t.Any], salt: _t_opt_str_bytes = None) -> _t.Any:
         """Like :meth:`loads` but loads from a file."""
         return self.loads(f.read(), salt)
 
@@ -287,7 +289,9 @@ class Serializer:
             except BadPayload:
                 return False, None
 
-    def load_unsafe(self, f: _t.IO, salt: _t_opt_str_bytes = None) -> _t_load_unsafe:
+    def load_unsafe(
+        self, f: _t.IO[_t.Any], salt: _t_opt_str_bytes = None
+    ) -> _t_load_unsafe:
         """Like :meth:`loads_unsafe` but loads from a file.
 
         .. versionadded:: 0.15