diff --git a/mypy.ini b/mypy.ini
index 4fba13c286..19b4de03a3 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -20,9 +20,9 @@ exclude = (?x)(
 # Too many false-positives
 disable_error_code = overload-overlap
 
-# Ignoring attr-defined because setuptools wraps a lot of distutils classes, adding new attributes,
-# w/o updating all the attributes and return types from the base classes for type-checkers to understand
-# Especially with setuptools.dist.command vs distutils.dist.command vs setuptools._distutils.dist.command
+# DistributionMetadata.license_files and DistributionMetadata.license_file
+# are dynamically patched in setuptools/_core_metadata.py
+# and no DistributionMetadata subclass exists in setuptools
 [mypy-setuptools.*]
 disable_error_code = attr-defined
 
diff --git a/setuptools/command/build_ext.py b/setuptools/command/build_ext.py
index da8d56fac2..0a2af0dd53 100644
--- a/setuptools/command/build_ext.py
+++ b/setuptools/command/build_ext.py
@@ -12,6 +12,7 @@
 from distutils.sysconfig import customize_compiler, get_config_var
 from distutils import log
 
+from setuptools.dist import Distribution
 from setuptools.errors import BaseError
 from setuptools.extension import Extension, Library
 
@@ -83,6 +84,7 @@ def get_abi3_suffix():
 
 
 class build_ext(_build_ext):
+    distribution: Distribution  # override distutils.dist.Distribution with setuptools.dist.Distribution
     editable_mode: bool = False
     inplace: bool = False
 
diff --git a/setuptools/command/build_py.py b/setuptools/command/build_py.py
index 15a4f63fdd..0cdb64f424 100644
--- a/setuptools/command/build_py.py
+++ b/setuptools/command/build_py.py
@@ -14,8 +14,9 @@
 from typing import Iterable, Iterator
 
 from more_itertools import unique_everseen
-from ..warnings import SetuptoolsDeprecationWarning
 
+from ..dist import Distribution
+from ..warnings import SetuptoolsDeprecationWarning
 
 _IMPLICIT_DATA_FILES = ('*.pyi', 'py.typed')
 
@@ -34,6 +35,7 @@ class build_py(orig.build_py):
     'py_modules' and 'packages' in the same setup operation.
     """
 
+    distribution: Distribution  # override distutils.dist.Distribution with setuptools.dist.Distribution
     editable_mode: bool = False
     existing_egg_info_dir: str | None = None  #: Private API, internal use only.
 
diff --git a/setuptools/command/editable_wheel.py b/setuptools/command/editable_wheel.py
index 5ad8ecdd6a..abc7b9f2c8 100644
--- a/setuptools/command/editable_wheel.py
+++ b/setuptools/command/editable_wheel.py
@@ -153,6 +153,7 @@ def run(self):
             self._create_wheel_file(bdist_wheel)
         except Exception:
             traceback.print_exc()
+            # TODO: Fix false-positive [attr-defined] in typeshed
             project = self.distribution.name or self.distribution.get_name()
             _DebuggingTips.emit(project=project)
             raise
diff --git a/setuptools/command/egg_info.py b/setuptools/command/egg_info.py
index 30b62f5f2e..8a2d42ea04 100644
--- a/setuptools/command/egg_info.py
+++ b/setuptools/command/egg_info.py
@@ -24,13 +24,14 @@
 from setuptools.command.sdist import walk_revctrl
 from setuptools.command.setopt import edit_config
 from setuptools.command import bdist_egg
+from setuptools.dist import Distribution
 import setuptools.unicode_utils as unicode_utils
 from setuptools.glob import glob
 
-import packaging
+import packaging.requirements
+import packaging.version
 from ..warnings import SetuptoolsDeprecationWarning
 
-
 PY_MAJOR = '{}.{}'.format(*sys.version_info)
 
 
@@ -520,6 +521,7 @@ def _safe_path(self, path):
 
 
 class manifest_maker(sdist):
+    distribution: Distribution  # override distutils.dist.Distribution with setuptools.dist.Distribution
     template = "MANIFEST.in"
 
     def initialize_options(self):
diff --git a/setuptools/command/install.py b/setuptools/command/install.py
index f1ea2adf1d..12ef06f542 100644
--- a/setuptools/command/install.py
+++ b/setuptools/command/install.py
@@ -9,6 +9,7 @@
 from typing import Any, ClassVar, cast
 
 import setuptools
+from ..dist import Distribution
 from ..warnings import SetuptoolsDeprecationWarning, SetuptoolsWarning
 from .bdist_egg import bdist_egg as bdist_egg_cls
 
@@ -20,6 +21,8 @@
 class install(orig.install):
     """Use easy_install to install the package, w/dependencies"""
 
+    distribution: Distribution  # override distutils.dist.Distribution with setuptools.dist.Distribution
+
     user_options = orig.install.user_options + [
         ('old-and-unmanageable', None, "Try not to use this!"),
         (
diff --git a/setuptools/command/install_lib.py b/setuptools/command/install_lib.py
index 3c77c6ebc6..d1577384df 100644
--- a/setuptools/command/install_lib.py
+++ b/setuptools/command/install_lib.py
@@ -3,12 +3,16 @@
 import sys
 from itertools import product, starmap
 import distutils.command.install_lib as orig
+
 from .._path import StrPath
+from ..dist import Distribution
 
 
 class install_lib(orig.install_lib):
     """Don't add compiled flags to filenames of non-Python files"""
 
+    distribution: Distribution  # override distutils.dist.Distribution with setuptools.dist.Distribution
+
     def run(self):
         self.build()
         outfiles = self.install()
diff --git a/setuptools/command/install_scripts.py b/setuptools/command/install_scripts.py
index f44281b49b..fa5de91f46 100644
--- a/setuptools/command/install_scripts.py
+++ b/setuptools/command/install_scripts.py
@@ -6,11 +6,14 @@
 import sys
 
 from .._path import ensure_directory
+from ..dist import Distribution
 
 
 class install_scripts(orig.install_scripts):
     """Do normal script install, plus any egg_info wrapper scripts"""
 
+    distribution: Distribution  # override distutils.dist.Distribution with setuptools.dist.Distribution
+
     def initialize_options(self):
         orig.install_scripts.initialize_options(self)
         self.no_ep = False
diff --git a/setuptools/command/sdist.py b/setuptools/command/sdist.py
index a834ba4a78..ca0f712792 100644
--- a/setuptools/command/sdist.py
+++ b/setuptools/command/sdist.py
@@ -5,6 +5,7 @@
 from itertools import chain
 
 from .._importlib import metadata
+from ..dist import Distribution
 from .build import _ORIGINAL_SUBCOMMANDS
 
 _default_revctrl = list
@@ -43,6 +44,7 @@ class sdist(orig.sdist):
         ),
     ]
 
+    distribution: Distribution  # override distutils.dist.Distribution with setuptools.dist.Distribution
     negative_opt = {}
 
     README_EXTENSIONS = ['', '.rst', '.txt', '.md']
diff --git a/setuptools/command/upload.py b/setuptools/command/upload.py
index 1cca47cea9..e05c82ae0f 100644
--- a/setuptools/command/upload.py
+++ b/setuptools/command/upload.py
@@ -1,12 +1,15 @@
 from distutils import log
 from distutils.command import upload as orig
 
+from setuptools.dist import Distribution
 from setuptools.errors import RemovedCommandError
 
 
 class upload(orig.upload):
     """Formerly used to upload packages to PyPI."""
 
+    distribution: Distribution  # override distutils.dist.Distribution with setuptools.dist.Distribution
+
     def run(self):
         msg = (
             "The upload command has been removed, use twine to upload "
diff --git a/setuptools/config/pyprojecttoml.py b/setuptools/config/pyprojecttoml.py
index a83e43bb35..b7d521b7ad 100644
--- a/setuptools/config/pyprojecttoml.py
+++ b/setuptools/config/pyprojecttoml.py
@@ -121,7 +121,7 @@ def read_configuration(
     # the default would be an improvement.
     # `ini2toml` backfills include_package_data=False when nothing is explicitly given,
     # therefore setting a default here is backwards compatible.
-    if dist and getattr(dist, "include_package_data", None) is not None:
+    if dist and dist.include_package_data is not None:
         setuptools_table.setdefault("include-package-data", dist.include_package_data)
     else:
         setuptools_table.setdefault("include-package-data", True)
diff --git a/setuptools/dist.py b/setuptools/dist.py
index 6c73ae792f..03017e56e1 100644
--- a/setuptools/dist.py
+++ b/setuptools/dist.py
@@ -265,6 +265,8 @@ def __init__(self, attrs: MutableMapping | None = None) -> None:
             self.package_data: dict[str, list[str]] = {}
         attrs = attrs or {}
         self.dist_files: list[tuple[str, str, str]] = []
+        self.include_package_data: bool | None = None
+        self.exclude_package_data: dict[str, list[str]] | None = None
         # Filter-out setuptools' specific options.
         self.src_root = attrs.pop("src_root", None)
         self.dependency_links = attrs.pop('dependency_links', [])
diff --git a/setuptools/extension.py b/setuptools/extension.py
index 8a8a9206fe..96d392ef2b 100644
--- a/setuptools/extension.py
+++ b/setuptools/extension.py
@@ -127,6 +127,15 @@ class Extension(_Extension):
       specified on Windows. (since v63)
     """
 
+    # These 4 are set and used in setuptools/command/build_ext.py
+    # The lack of a default value and risk of `AttributeError` is purposeful
+    # to avoid people forgetting to call finalize_options if they modify the extension list.
+    # See example/rationale in https://github.com/pypa/setuptools/issues/4529.
+    _full_name: str  #: Private API, internal use only.
+    _links_to_dynamic: bool  #: Private API, internal use only.
+    _needs_stub: bool  #: Private API, internal use only.
+    _file_name: str  #: Private API, internal use only.
+
     def __init__(self, name: str, sources, *args, py_limited_api: bool = False, **kw):
         # The *args is needed for compatibility as calls may use positional
         # arguments. py_limited_api may be set only via keyword.
diff --git a/setuptools/tests/__init__.py b/setuptools/tests/__init__.py
index 738ebf43be..415ece4234 100644
--- a/setuptools/tests/__init__.py
+++ b/setuptools/tests/__init__.py
@@ -6,10 +6,9 @@
 
 __all__ = ['fail_on_ascii']
 
-locale_encoding = (
-    locale.getencoding()
-    if sys.version_info >= (3, 11)
-    else locale.getpreferredencoding(False)
-)
+if sys.version_info >= (3, 11):
+    locale_encoding = locale.getencoding()
+else:
+    locale_encoding = locale.getpreferredencoding(False)
 is_ascii = locale_encoding == 'ANSI_X3.4-1968'
 fail_on_ascii = pytest.mark.xfail(is_ascii, reason="Test fails in this locale")
diff --git a/setuptools/tests/test_build_ext.py b/setuptools/tests/test_build_ext.py
index 0482fb5d5c..943fc6df2f 100644
--- a/setuptools/tests/test_build_ext.py
+++ b/setuptools/tests/test_build_ext.py
@@ -189,6 +189,7 @@ def get_build_ext_cmd(self, optional: bool, **opts):
         dist = Distribution(dict(ext_modules=[extension]))
         dist.script_name = 'setup.py'
         cmd = build_ext(dist)
+        # TODO: False-positive [attr-defined], raise upstream
         vars(cmd).update(build_lib=".build/lib", build_temp=".build/tmp", **opts)
         cmd.ensure_finalized()
         return cmd