Enable more of mypy's diagnostics

mypy.ini

@@ -1,12 +1,41 @@
 [mypy]
 namespace_packages = True
 
+# Enable strict optional checks
 strict_optional = True
+
+# Disallow incomplete or untyped definitions
 disallow_incomplete_defs = True
 disallow_untyped_defs = True
+disallow_untyped_calls = True
+disallow_untyped_decorators = True
+
+# Disallow the use of `Any` in various contexts
+disallow_any_generics = True
+disallow_any_unimported = True
+disallow_subclassing_any = True
+
+# Ensure strict equality checks
+strict_equality = True
+
+# Enable warnings for redundant casts, unreachable code, and functions that return `Any`
+warn_redundant_casts = True
+warn_unreachable = True
+warn_return_any = True
 
+# Additional warnings
 warn_unused_ignores = True
 warn_unused_configs = True
-warn_redundant_casts = True
 
+# Additional strict checks
+check_untyped_defs = True
+no_implicit_optional = True
+extra_checks = True
+local_partial_types = True
+show_error_context = True
+
+# Import handling
 ignore_missing_imports = False
+
+# Disallow redefinition of variables
+allow_redefinition = False